TI ADS1260-Q1/11：高性能汽车级24位Δ-ΣADC详解

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TI-ADS1260-Q1和ADS1261-Q1是高性能的24位Δ-Σ型模拟到数字转换器（ADC），专为汽车应用设计，符合AEC-Q100标准，适用于严苛的温度范围(-40°C 至 +125°C)。这些ADC的核心特性包括： 1. **高精度与稳定性**： - 24位分辨率确保了极高的测量精度，线性度达到2ppm，这意味着在全量程内信号转换的误差非常低。 - 温度漂移极小，1nV/°C的温漂和0.5ppm/°C的增益漂移，确保了长期稳定的性能。 - 噪声水平低，典型值为30nVRMS（在20SPS时，增益设置为128）。 2. **可调增益和宽输入范围**： - 提供CMOS PGA增益选择，范围从1到128，适应各种输入信号的需求。 - 输入电压范围广泛，支持±7mV至±5V，适应传感器的多样化的电压输出。 3. **灵活的数据速率**： - ADC支持从2.5SPS到高达40kSPS的数据采集速率，可根据实时处理需求进行调整。 4. **内置功能**： - 包含PGA、输入多路复用器、数字滤波器、串行接口以及CRC校验功能，提高了信号处理效率和数据可靠性。 - 内置参考监控信号和供电监控，有助于系统健康管理和故障诊断。 5. **电源管理**： - 内置PWDN引脚可以实现低功耗模式，适合电池供电的汽车应用。 - 用于传感器测试的GPIO和AC-Exc功能，方便设备配置和调试。 6. **兼容性和文档支持**： - 该产品系列支持多种参考电压选择，包括2.5V和3V±5V，同时提供参考多路复用器。 - 文档更新至2019年1月，建议用户访问TI官方网站获取最新的英文数据手册（SBAS784），因为英文资料始终是最新的官方信息来源。在实际设计过程中，务必参考英文原版数据表以获取最准确的设计指导，并注意TI对翻译内容的免责声明，确保在设计之前了解所有重要细节。

ADVANCEINFORMATION

ADS1260-Q1

ADS1261-Q1

ZHCSJC0 –JANUARY 2019

www.ti.com.cn

8 Parameter Measurement Information

8.1 Noise Performance

The ADS126x-Q1 noise performance depends on the ADC configuration: data rate, PGA gain, digital filter

configuration, and chop mode. The combination of the parameters affect noise performance. Two significant

factors affecting noise performance are data rate and PGA gain. Since the profile of noise is predominantly white

(flat vs frequency), decreasing the data rate proportionally decreases bandwidth and therefore, total noise. Since

the noise of the PGA is lower than that of the modulator of the ADC, increasing the gain reduces noise when

treated as an input-referred quantity. Noise performance also depends on the digital filter and chop mode. As the

order of the digital filter increases, the noise bandwidth correspondingly decreases resulting in lower noise.

Further, as a result of two-point data averaging in chop mode, noise performance improves by √2 compared to

normal operation.

表 1 shows noise performance in units of μV

RMS

(RMS = root mean square) under the conditions listed. The

values in parenthesis are peak-to-peak values. 表 2 shows the noise performance in effective resolution (bits)

under the specified conditions. The values shown in parenthesis are the noise-free resolution. Noise-free

resolution is the resolution of the ADC with no code flicker. The noise-free resolution data are calculated based

on the peak-to-peak noise measurements.

The effective resolution data listed in the tables are calculated using 公式 1:

Effective Resolution or Noise-Free Resolution = ln (FSR / e

) / ln (2)

where

• FSR = full scale range = 2 · V

REF

/ Gain (See Recommended Operating Conditions for FSR)

• e

= Input referred voltage noise (RMS value to calculate effective resolution, p-p value to calculate noise-free

resolution) (1)

The data shown in the noise performance table represent typical ADC performance at T

= 25°C. The noise-

performance data are the standard deviation and peak-to-peak computations of the ADC data. The noise data

are acquired with inputs shorted, based on consecutive ADC readings for a period of ten seconds or 8192 data

points, whichever occurs first. Because of the statistical nature of noise, repeated noise measurements may yield

higher or lower noise performance results.

As a result of the increased full-scale input range provided by 5-V reference operation, effective resolution and

noise-free resolution performance are typically optimized using a 5-V reference. The effective resolution and

noise-free resolution performance data shown in 表 2 are with external 5-V reference operation.

表表 1. Noise in µV

RMS

(µV

) at T

= 25°C and Internal 2.5-V Reference

DATA

RATE

(SPS)

FILTER

GAIN

1 2 4 8 16 32 64 128

2.5 FIR 0.18 (0.6) 0.078 (0.28) 0.046 (0.16) 0.025 (0.096) 0.014 (0.053) 0.012 (0.045) 0.01 (0.042) 0.01 (0.04)

2.5 Sinc1 0.15 (0.47) 0.071 (0.28) 0.038 (0.14) 0.019 (0.075) 0.012 (0.051) 0.01 (0.039) 0.009 (0.037) 0.009 (0.037)

2.5 Sinc2 0.14 (0.38) 0.065 (0.23) 0.032 (0.096) 0.018 (0.059) 0.011 (0.037) 0.007 (0.028) 0.007 (0.028) 0.008 (0.033)

2.5 Sinc3 0.12 (0.38) 0.062 (0.17) 0.028 (0.064) 0.016 (0.053) 0.01 (0.035) 0.008 (0.027) 0.007 (0.026) 0.006 (0.023)

2.5 Sinc4 0.1 (0.26) 0.059 (0.17) 0.032 (0.085) 0.016 (0.059) 0.010 (0.035) 0.008 (0.027) 0.006 (0.025) 0.006 (0.024)

5 FIR 0.22 (0.89) 0.11 (0.4) 0.058 (0.24) 0.032 (0.13) 0.021 (0.085) 0.016 (0.065) 0.014 (0.061) 0.015 (0.066)

5 Sinc1 0.18 (0.6) 0.093 (0.36) 0.047 (0.17) 0.025 (0.11) 0.017 (0.069) 0.014 (0.061) 0.012 (0.054) 0.014 (0.063)

5 Sinc2 0.16 (0.64) 0.084 (0.32) 0.043 (0.16) 0.023 (0.085) 0.015 (0.064) 0.011 (0.047) 0.010(0.046) 0.011 (0.049)

5 Sinc3 0.13 (0.51) 0.088 (0.32) 0.036 (0.15) 0.024 (0.091) 0.014 (0.053) 0.01 (0.043) 0.009 (0.045) 0.009 (0.042)

5 Sinc4 0.13 (0.51) 0.077 (0.28) 0.034 (0.12) 0.021 (0.075) 0.013 (0.053) 0.010 (0.044) 0.008 (0.038) 0.009 (0.038)

10 FIR 0.27 (1.4) 0.14 (0.72) 0.076 (0.4) 0.042 (0.21) 0.029 (0.15) 0.023 (0.12) 0.023 (0.11) 0.022 (0.11)

10 Sinc1 0.23 (1.1) 0.13 (0.57) 0.064 (0.3) 0.036 (0.19) 0.024 (0.13) 0.02 (0.1) 0.018 (0.083) 0.018 (0.089)

10 Sinc2 0.2 (0.89) 0.11 (0.51) 0.054 (0.24) 0.03 (0.14) 0.019 (0.093) 0.015 (0.075) 0.015 (0.079) 0.016 (0.077)

10 Sinc3 0.18 (0.81) 0.097 (0.38) 0.05 (0.22) 0.028 (0.14) 0.019 (0.088) 0.015 (0.063) 0.013 (0.067) 0.013 (0.065)

10 Sinc4 0.17 (0.68) 0.099 (0.45) 0.049 (0.24) 0.024 (0.12) 0.018 (0.085) 0.013 (0.063) 0.012 (0.061) 0.012 (0.062)

16.6 Sinc1 0.3 (1.4) 0.16 (0.81) 0.082 (0.43) 0.048 (0.25) 0.031 (0.17) 0.025 (0.15) 0.024 (0.12) 0.024 (0.14)

ADVANCEINFORMATION

ADS1260-Q1

ADS1261-Q1

www.ti.com.cn

ZHCSJC0 –JANUARY 2019

Noise Performance (接接下下页页)

表表 1. Noise in µV

RMS

(µV

) at T

= 25°C and Internal 2.5-V Reference (接接下下页页)

DATA

RATE

(SPS)

FILTER

GAIN

1 2 4 8 16 32 64 128

16.6 Sinc2 0.24 (1.2) 0.13 (0.64) 0.067 (0.34) 0.038 (0.2) 0.026 (0.14) 0.021 (0.11) 0.019 (0.099) 0.019 (0.098)

16.6 Sinc3 0.22 (0.98) 0.12 (0.64) 0.065 (0.3) 0.036 (0.18) 0.024 (0.12) 0.019 (0.095) 0.017 (0.092) 0.018 (0.093)

16.6 Sinc4 0.21 (1.1) 0.12 (0.53) 0.06 (0.29) 0.035 (0.18) 0.022 (0.11) 0.017 (0.084) 0.016 (0.085) 0.016 (0.086)

20 FIR 0.37 (2) 0.2 (1.1) 0.1 (0.56) 0.059 (0.34) 0.041 (0.22) 0.034 (0.18) 0.029 (0.17) 0.03 (0.15)

20 Sinc1 0.32 (1.8) 0.18 (0.92) 0.091 (0.48) 0.051 (0.26) 0.034 (0.2) 0.028 (0.15) 0.025 (0.14) 0.025 (0.14)

20 Sinc2 0.27 (1.4) 0.15 (0.77) 0.073 (0.35) 0.042 (0.22) 0.027 (0.14) 0.022 (0.13) 0.021 (0.11) 0.02 (0.11)

20 Sinc3 0.24 (1.2) 0.13 (0.64) 0.069 (0.35) 0.039 (0.21) 0.026 (0.14) 0.02 (0.11) 0.018 (0.099) 0.018 (0.1)

20 Sinc4 0.23 (1.1) 0.13 (0.66) 0.066 (0.33) 0.037 (0.19) 0.024 (0.12) 0.018 (0.095) 0.017 (0.095) 0.017 (0.099)

50 Sinc1 0.49 (2.9) 0.27 (1.6) 0.14 (0.83) 0.08 (0.5) 0.053 (0.31) 0.043 (0.25) 0.039 (0.23) 0.038 (0.23)

50 Sinc2 0.4 (2.3) 0.22 (1.3) 0.11 (0.69) 0.064 (0.38) 0.043 (0.27) 0.035 (0.22) 0.033 (0.2) 0.032 (0.2)

50 Sinc3 0.37 (2.2) 0.2 (1.2) 0.11 (0.64) 0.058 (0.35) 0.04 (0.25) 0.033 (0.19) 0.029 (0.18) 0.03 (0.18)

50 Sinc4 0.34 (2) 0.19 (1.1) 0.098 (0.61) 0.056 (0.32) 0.036 (0.23) 0.03 (0.17) 0.028 (0.17) 0.028 (0.17)

60 Sinc1 0.55 (3.3) 0.28 (1.9) 0.15 (0.88) 0.087 (0.53) 0.058 (0.34) 0.047 (0.28) 0.044 (0.29) 0.042 (0.26)

60 Sinc2 0.45 (2.7) 0.24 (1.4) 0.12 (0.71) 0.07 (0.45) 0.048 (0.32) 0.039 (0.25) 0.036 (0.21) 0.035 (0.21)

60 Sinc3 0.41 (2.7) 0.21 (1.3) 0.11 (0.68) 0.065 (0.4) 0.044 (0.25) 0.036 (0.23) 0.032 (0.19) 0.031 (0.19)

60 Sinc4 0.37 (2) 0.2 (1.1) 0.11 (0.6) 0.059 (0.36) 0.041 (0.25) 0.033 (0.21) 0.03 (0.18) 0.03 (0.17)

100 Sinc1 0.69 (4.5) 0.37 (2.4) 0.19 (1.3) 0.11 (0.73) 0.075 (0.5) 0.06 (0.39) 0.056 (0.37) 0.056 (0.38)

100 Sinc2 0.56 (3.5) 0.3 (1.9) 0.16 (0.97) 0.09 (0.55) 0.062 (0.39) 0.051 (0.32) 0.046 (0.31) 0.045 (0.29)

100 Sinc3 0.51 (3.4) 0.27 (1.8) 0.14 (0.9) 0.083 (0.51) 0.056 (0.36) 0.045 (0.3) 0.041 (0.27) 0.041 (0.25)

100 Sinc4 0.48 (3.3) 0.26 (1.6) 0.14 (0.87) 0.078 (0.48) 0.053 (0.34) 0.043 (0.27) 0.039 (0.24) 0.039 (0.26)

400 Sinc1 1.4 (9.6) 0.72 (5.4) 0.38 (2.7) 0.22 (1.6) 0.15 (1.1) 0.12 (0.85) 0.11 (0.85) 0.11 (0.79)

400 Sinc2 1.1 (8.2) 0.58 (4.2) 0.31 (2.3) 0.18 (1.3) 0.12 (0.9) 0.099 (0.74) 0.091 (0.65) 0.091 (0.69)

400 Sinc3 1 (7.4) 0.53 (3.7) 0.28 (2) 0.17 (1.2) 0.11 (0.8) 0.09 (0.66) 0.083 (0.61) 0.083 (0.59)

400 Sinc4 0.95 (6.9) 0.51 (3.6) 0.27 (1.9) 0.15 (1.2) 0.1 (0.7) 0.084 (0.58) 0.077 (0.55) 0.077 (0.57)

1200 Sinc1 2.3 (17) 1.2 (9.2) 0.64 (5) 0.37 (2.9) 0.25 (1.9) 0.2 (1.6) 0.19 (1.4) 0.19 (1.5)

1200 Sinc2 1.9 (14) 1 (7.6) 0.54 (3.9) 0.31 (2.4) 0.21 (1.6) 0.17 (1.3) 0.16 (1.2) 0.16 (1.2)

1200 Sinc3 1.8 (13) 0.92 (7) 0.49 (3.7) 0.29 (2.2) 0.19 (1.4) 0.16 (1.2) 0.14 (1.1) 0.14 (1.1)

1200 Sinc4 1.6 (12) 0.86 (6.4) 0.46 (3.6) 0.27 (2) 0.18 (1.4) 0.15 (1.1) 0.13 (1) 0.13 (1)

2400 Sinc1 3.2 (25) 1.7 (13) 0.88 (6.7) 0.51 (3.9) 0.35 (2.7) 0.28 (2.2) 0.26 (2) 0.26 (2)

2400 Sinc2 2.7 (21) 1.4 (10) 0.76 (5.8) 0.44 (3.3) 0.3 (2.2) 0.24 (1.9) 0.22 (1.6) 0.22 (1.6)

2400 Sinc3 2.5 (19) 1.3 (9.8) 0.69 (5.2) 0.4 (3) 0.27 (2.1) 0.22 (1.7) 0.2 (1.6) 0.2 (1.5)

2400 Sinc4 2.3 (17) 1.2 (9.4) 0.65 (4.9) 0.37 (2.8) 0.25 (2) 0.21 (1.5) 0.19 (1.5) 0.19 (1.4)

4800 Sinc1 4.3 (33) 2.3 (17) 1.2 (9.4) 0.69 (5.2) 0.46 (3.5) 0.37 (2.9) 0.34 (2.6) 0.34 (2.6)

4800 Sinc2 3.8 (29) 2 (15) 1.1 (8.5) 0.61 (4.7) 0.41 (3.1) 0.33 (2.6) 0.31 (2.3) 0.3 (2.3)

4800 Sinc3 3.5 (27) 1.8 (14) 0.97 (7.2) 0.56 (4.1) 0.38 (3) 0.31 (2.4) 0.28 (2.1) 0.28 (2.2)

4800 Sinc4 3.3 (25) 1.7 (13) 0.92 (7.1) 0.53 (4.1) 0.36 (2.7) 0.29 (2.2) 0.27 (2.1) 0.27 (1.9)

7200 Sinc1 5 (38) 2.6 (20) 1.4 (10) 0.8 (6) 0.53 (4) 0.43 (3.2) 0.39 (2.9) 0.39 (2.9)

7200 Sinc2 4.6 (35) 2.4 (19) 1.3 (9.9) 0.73 (5.4) 0.49 (3.8) 0.39 (2.9) 0.36 (2.8) 0.36 (2.7)

7200 Sinc3 4.3 (33) 2.2 (17) 1.2 (9.3) 0.68 (5) 0.46 (3.6) 0.37 (2.8) 0.34 (2.5) 0.34 (2.6)

7200 Sinc4 4.1 (31) 2.1 (15) 1.1 (8.8) 0.65 (5) 0.44 (3.3) 0.35 (2.6) 0.33 (2.5) 0.32 (2.5)

14400 Sinc5 6 (47) 3.1 (24) 1.7 (13) 0.93 (7.1) 0.61 (4.9) 0.49 (3.8) 0.45 (3.5) 0.45 (3.4)

19200 Sinc5 8.5 (67) 4.3 (34) 2.3 (17) 1.2 (9.6) 0.77 (6) 0.57 (4.3) 0.54 (4) 0.53 (4.1)

25600 Sinc5 19 (140) 9.5 (73) 4.8 (37) 2.5 (18) 1.3 (10) 0.83 (6.3) 0.8 (6) 0.81 (6)

40000 Sinc5 30 (220) 15 (110) 7.7 (56) 3.9 (29) 2 (15) 1.2 (9.4) 1.2 (8.9) 1.2 (9)

ADVANCEINFORMATION

ADS1260-Q1

ADS1261-Q1

ZHCSJC0 –JANUARY 2019

www.ti.com.cn

表表 2. Effective Resolution (Noise-Free Resolution) at T

= 25°C and External 5-V Reference

DATA

RATE

(SPS)

FILTER

GAIN

1 2 4 8 16 32 64 128

2.5 FIR 24 (24) 24 (22.8) 24 (23.8) 24 (23.8) 24 (23.8) 24 (22.8) 24 (22) 23 (20.8)

2.5 Sinc1 24 (24) 24 (22.8) 24 (23.8) 24 (23.8) 24 (22.8) 24 (22.8) 24 (22.4) 23.2 (21.2)

2.5 Sinc2 24 (24) 24 (22.8) 24 (23.8) 22.8 (23.8) 21.8 (22.8) 24 (23.8) 24 (22.4) 23.9 (22)

2.5 Sinc3 24 (24) 24 (22.8) 24 (23.8) 22.8 (23.8) 24 (23.8) 24 (23.8) 24 (22.4) 23.8 (22)

2.5 Sinc4 24 (24) 24 (22.8) 24 (23.8) 22.8 (23.8) 24 (23.8) 24 (23.8) 24 (23) 23.5 (22)

5 FIR 24 (23) 24 (22.8) 24 (23.8) 24 (22.8) 24 (22.2) 24 (21.8) 23.6 (21.7) 22.5 (20.7)

5 Sinc1 24 (23.7) 24 (23.8) 24 (23.8) 24 (22.8) 24 (22.2) 24 (22.8) 23.3 (21.4) 22.8 (20.7)

5 Sinc2 24 (24) 24 (23.8) 24 (23.8) 24 (23.8) 24 (23.8) 24 (22.8) 23.7 (21.7) 22.8 (21)

5 Sinc3 24 (24) 24 (23.8) 24 (23.8) 24 (23.8) 24 (23.8) 24 (22.8) 23.5 (21.4) 23.5 (21.7)

5 Sinc4 24 (24) 24 (23.8) 24 (23.8) 22.8 (23.8) 24 (23.8) 24 (23.8) 24 (22) 23.3 (21.2)

10 FIR 24 (22.4) 24 (22.8) 24 (22.8) 24 (22.2) 24 (21.8) 23.5 (21.2) 22.8 (20.5) 22.1 (19.9)

10 Sinc1 24 (23) 24 (22.8) 24 (22.8) 24 (22.8) 24 (22.2) 23.6 (21.2) 23.4 (21.2) 22.3 (19.8)

10 Sinc2 24 (23) 24 (22.8) 24 (22.8) 24 (22.8) 24 (22.2) 24 (22.2) 23.2 (21.4) 22.3 (20.2)

10 Sinc3 24 (24) 24 (22.8) 24 (23.8) 24 (23.8) 24 (22.8) 24 (22.2) 23.3 (21.2) 22.7 (20.7)

10 Sinc4 24 (24) 24 (22.8) 24 (23.8) 24 (22.8) 24 (22.8) 24 (22.2) 23.7 (21.4) 22.9 (20.8)

16.6 Sinc1 24 (22) 24 (21.8) 24 (22.2) 24 (21.8) 23.7 (21.2) 23.4 (21) 22.5 (20.3) 21.8 (19.6)

16.6 Sinc2 24 (22.4) 24 (22.8) 24 (22.2) 24 (22.2) 24 (21.8) 23.7 (21.2) 23 (20.7) 22 (19.5)

16.6 Sinc3 24 (23) 24 (22.8) 24 (22.2) 24 (22.8) 24 (22.8) 23.9 (21.5) 23.1 (21) 22 (19.8)

16.6 Sinc4 24 (23) 24 (22.8) 24 (22.8) 24 (22.8) 24 (22.2) 24 (21.5) 23.4 (20.7) 22.5 (20.1)

20 FIR 24 (22) 23.8 (21.5) 23.9 (21.8) 23.9 (21.5) 23.5 (21) 22.9 (20.5) 22.2 (19.8) 21.3 (18.7)

20 Sinc1 24 (22) 24 (22.2) 24 (21.8) 23.9 (21.8) 23.7 (21.5) 23.3 (21) 22.6 (20.3) 21.5 (19.2)

20 Sinc2 24 (23) 24 (22.2) 24 (22.2) 24 (21.8) 24 (21.8) 23.6 (21.2) 22.8 (20.3) 21.9 (19.6)

20 Sinc3 24 (22.4) 24 (22.8) 24 (22.2) 24 (22.8) 24 (21.8) 23.7 (21.5) 23 (20.7) 21.9 (19.4)

20 Sinc4 24 (23) 24 (22.8) 24 (22.8) 24 (22.2) 24 (22.2) 23.8 (21.2) 23.1 (20.7) 22 (19.4)

50 Sinc1 23.9 (21.4) 23.7 (21.5) 23.7 (21.2) 23.5 (20.8) 23.3 (20.6) 22.6 (20) 21.9 (19.3) 21 (18.6)

50 Sinc2 24 (21.7) 23.9 (21.5) 23.8 (21.2) 23.7 (21.5) 23.5 (20.8) 22.9 (20.2) 22.1 (19.3) 21.2 (18.8)

50 Sinc3 24 (22) 23.9 (21.5) 23.9 (21.5) 23.8 (21) 23.6 (21.2) 23 (20.5) 22.3 (19.8) 21.3 (18.6)

50 Sinc4 24 (22) 24 (21.8) 24 (21.8) 23.9 (21.5) 23.7 (21.2) 23.2 (20.8) 22.4 (20) 21.5 (18.9)

60 Sinc1 23.7 (21.4) 23.6 (21) 23.6 (21.2) 23.4 (20.8) 23.1 (20.5) 22.5 (19.9) 21.8 (19.1) 20.8 (18.2)

60 Sinc2 24 (21.4) 23.8 (21.5) 23.7 (21.2) 23.6 (21.2) 23.4 (20.8) 22.7 (20.2) 22.1 (19.3) 21.2 (18.5)

60 Sinc3 24 (21.7) 23.9 (21.5) 23.9 (21.5) 23.7 (21.2) 23.5 (20.8) 22.9 (20.5) 22.2 (19.5) 21.2 (18.8)

60 Sinc4 24 (22) 24 (21.8) 23.9 (21.5) 23.7 (21.2) 23.4 (20.6) 23 (20.2) 22.2 (19.5) 21.2 (18.7)

100 Sinc1 23.6 (21) 23.4 (20.6) 23.3 (20.5) 23.1 (20.4) 22.8 (20) 22.1 (19.4) 21.4 (18.8) 20.5 (17.7)

100 Sinc2 23.8 (21) 23.6 (21) 23.6 (21) 23.4 (21) 23 (20.2) 22.4 (19.7) 21.7 (19.1) 20.8 (18)

100 Sinc3 23.8 (21.2) 23.6 (21.2) 23.6 (21) 23.5 (21) 23.2 (20.5) 22.5 (19.9) 21.8 (19) 20.8 (17.9)

100 Sinc4 23.9 (21.4) 23.7 (21.2) 23.7 (21.2) 23.6 (21) 23.3 (20.6) 22.6 (19.7) 21.9 (19.4) 21 (18.1)

400 Sinc1 22.8 (19.8) 22.5 (19.7) 22.5 (19.6) 22.3 (19.6) 21.9 (19) 21.2 (18.2) 20.4 (17.6) 19.5 (16.6)

400 Sinc2 23.1 (20.3) 22.8 (20.1) 22.8 (20) 22.6 (19.6) 22.1 (19.2) 21.4 (18.6) 20.7 (17.9) 19.8 (17.1)

400 Sinc3 23.1 (20.4) 22.9 (20) 22.8 (19.9) 22.7 (20) 22.3 (19.4) 21.5 (18.7) 20.8 (17.8) 19.9 (17)

400 Sinc4 23.2 (20.3) 23 (20.2) 22.9 (20.1) 22.7 (20.1) 22.3 (19.5) 21.7 (18.9) 21 (18) 20 (17.2)

1200 Sinc1 22.1 (19.2) 21.8 (19.1) 21.7 (18.9) 21.6 (18.7) 21.1 (18.3) 20.4 (17.5) 19.7 (16.8) 18.8 (15.7)

1200 Sinc2 22.3 (19.5) 22.1 (19.3) 22 (19.1) 21.8 (18.9) 21.4 (18.4) 20.6 (17.7) 20 (17.1) 19 (16)

1200 Sinc3 22.4 (19.6) 22.2 (19.2) 22.1 (19.2) 21.9 (19) 21.5 (18.5) 20.8 (18) 20.1 (17.2) 19.2 (16.2)

1200 Sinc4 22.5 (19.6) 22.3 (19.6) 22.2 (19.2) 22 (19.1) 21.6 (18.7) 20.9 (18) 20.2 (17.3) 19.2 (16.4)

2400 Sinc1 21.6 (18.7) 21.4 (18.3) 21.3 (18.4) 21.1 (18.1) 20.7 (17.7) 19.9 (17.1) 19.2 (16.2) 18.3 (15.4)

2400 Sinc2 21.8 (18.8) 21.6 (18.6) 21.5 (18.6) 21.3 (18.5) 20.9 (18) 20.2 (17.3) 19.5 (16.6) 18.5 (15.6)

ADVANCEINFORMATION

ADS1260-Q1

ADS1261-Q1

ZHCSJC0 –JANUARY 2019

www.ti.com.cn

9 Detailed Description

9.1 Overview

The ADS1260-Q1 and ADS1261-Q1 are 5-channel and 10-channel, precision 24-bit, delta-sigma (ΔΣ) ADCs with

an integrated analog front end (AFE) and voltage reference. The low-noise and low-drift architecture make the

ADCs suitable for precision measurement of low signal level sensors, such as strain-gauge bridges, pressure

transducers and temperature sensors.

Key features of the ADC are:

• Very low noise, 1-GΩ input impedance PGA

• High-precision, 24-bit ΔΣ ADC

• Internal oscillator

• 2.5-V voltage reference

• Signal and voltage reference monitors

• Excitation current sources

• Input level-shift voltage

• Sensor burn-out current sources

• Temperature sensor

• Cyclic redundancy check (CRC) communication error detection

• Two voltage reference inputs ( ADS1261-Q1)

• Four GPIO with AC-excitation ( ADS1261-Q1)

The analog inputs (AINx) connect to the input multiplexer (MUX). The ADC supports three (five) differential or

five (ten) single-ended input configurations for the ADS1260-Q1 and ADS1261-Q1, respectively.

The programmable gain amplifier (PGA) follows the input multiplexer. The PGA is suitable for direct connection

to low-level sensors. The gain is programmable from 1 to 128. The PGA bypass option connects the analog

inputs directly to the precharge buffered modulator, extending the input voltage range to the power supplies. The

PGA output connects to pins CAPP and CAPN. The ADC antialias filter is provided at the PGA output with an

external capacitor.

The PGA is monitored to verify linear operation. Alarm bits in the status register set if the linear range of the PGA

is exceeded.

A delta-sigma modulator measures the input voltage relative to the reference voltage to produce the 24-bit

conversion result. The differential input range of the ADC is ±V

REF

/ Gain.

The digital filter averages and decimates the modulator output data to yield the final, down-sampled conversion

result. The sinc filter is programmable (sinc1 through sinc5) allowing optimization of conversion time, conversion

noise and line-cycle rejection. The finite impulse response (FIR) filter mode provides single-cycle settled data

with simultaneous rejection of 50-Hz and 60-Hz at data rates of 20 SPS or less.

The ADC reference is either 2.5-V internal, external or the 5-V analog power supply. The REFOUT pin provides

the buffered reference voltage output. The external reference is monitored for low or missing voltage. The

ADS1261-Q1 provides two voltage reference inputs, multiplexed with the analog inputs.

The ADC includes two current sources that provide excitation to resistive sensors (RTD). Additionally, the

ADS1261-Q1 provides four GPIO control lines. The GPIOs are used for input and output of general-purpose logic

signals, as well as providing drive signals for AC-excited bridges. The GPIOs are multiplexed to the analog

inputs.

The temperature sensor and the power supply voltages are read through the multiplexer. The programmable

burn-out test currents connect to the multiplexer output. The currents detect failed sensors or faults in the sensor

connection. The level-shift voltage on AINCOM provides the bias for floating sensors.

The SPI-compatible serial interface is used to read the conversion data and also to configure and control the

ADC. Data communication errors are detected by CRC. The serial interface consists of four signals: CS, SCLK,

DIN and DOUT/DRDY. The dual function DOUT/DRDY provides data output and also the data ready signal. The

ADC serial interface can be implemented with as little as three pins by tying CS low.

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