TLC7135中文资料：高精度CMOS双斜率ADC特性与接口详解
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更新于2024-10-28
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收藏 210KB PDF 举报 TLC7135是一款由Texas Instruments (TI)生产的高性能CMOS技术制造的41/2位双斜率积分型模拟到数字转换器(ADC)。这款器件的主要特点包括：
1. **零读数功能**：对于0伏输入，TLC7135能够提供精确的零点检测，确保测量的准确性。
2. **极性正确**：在零电压输入时，TLC7135具有真正的差分输入，这意味着信号的极性正确，减少了噪声干扰，提高了测量精度。
3. **低电流消耗**：典型输入电流为1 pA，这有助于降低功耗，延长设备的电池寿命或在电源受限的应用中提高效率。
4. **多路复用BCD输出**：通过输出D1至D4以及B1、B2、B4和B8这些二进制编码的十进制（BCD）输出，TLC7135可以方便地与LED显示器、LCD驱动器或者微处理器接口。
5. **低误差率**：其设计保证了低的滚降误差，最大误差范围为±1计数，提高了数据的可靠性和一致性。
6. **灵活性**：控制信号支持与通用异步接收/发送器(UART)或微处理器直接交互，使得它在多种系统架构中都能无缝集成。
7. **自动范围调整**：当接收到过范围或欠范围信号时，TLC7135具备自动范围调整能力，适应不同的输入条件。
8. **兼容性**：TLC7135是第二代产品，与Intersil ICL7135、Maxim ICL7135和Siliconix Si7135等同类产品兼容，体现了良好的市场兼容性。
9. **CMOS技术**：采用TI的高效CMOS工艺制造，确保了高集成度、低功耗和长期稳定性。
10. **多功能接口**：除了用于显示的接口，TLC7135还提供了数字化的输出，便于连接各种数字处理应用。
TLC7135作为一款高度集成的ADC，集成了模拟信号处理、BCD编码和微处理器接口等功能，广泛应用于需要精确测量和数据传输的工业控制、仪表设备以及消费电子产品中。其出色的设计和性能使得它在众多领域都表现出卓越的价值。
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
(1)
UNIT
Supply voltage (V
CC+
with respect to V
CC−
) 15 V
Analog input voltage (IN− or IN+) V
CC−
to V
CC+
Reference voltage range V
CC−
to V
CC+
Clock input voltage range 0 V to V
CC+
Operating free-air temperature range, T
A
0°C to 70°C
Storage temperature range, T
stg
−65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: N package 260°C
(1)
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
Supply voltage, V
CC+
4 5 6 V
Supply voltage, V
CC−
−3 −5 −8 V
Reference voltage, V
ref
1 V
High-level input voltage, CLK, RUN/HOLD, V
IH
2.8 V
Low-level input voltage, CLK, RUN/HOLD, V
IL
0.8 V
Differential input voltage, V
ID
V
CC−
+1 V
CC+
−0.5 V
Maximum operating frequency, f
clock
(see Note 1) 1.2 2 MHz
Operating free-air temperature range, T
A
0 70 °C
NOTE 1: Clock frequency range extends down to 0 Hz.
ELECTRICAL CHARACTERISTICS
V
CC+
= 5 V, V
CC−
= 5 V, V
ref
= 1 V, f
clock
= 120 kHz, T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
OH
High-level output voltage
D1-D5,B1,B2,B4,B8 I
O
= −1 mA 2.4 5
V
V
OH
High-level output voltage
Other outputs
I
O
= −10 µA 4.9 5
V
V
OL
Low-level output voltage I
O
= 1.6 mA 0.4 V
V
ON(PP)
Peak-to-peak output noise voltage (see Note 1) V
ID
= 0, Full scale = 2 V 15 µV
α
VO
Zero-reading temperature coefficient of output voltage V
ID
= 0, 0°C ≤ T
A
≤ 70°C 0.5 2 µV/°C
I
IH
High-level input current V
I
= 5 V, 0°C ≤ T
A
≤ 70°C 0.1 10 µA
I
IL
Low-level input current V
I
= 0 V, 0°C ≤ T
A
≤ 70°C −0.02 −0.1 mA
I
I
Input leakage current, IN− and IN+
V
ID
= 0
T
A
= 25°C 1 10
pA
I
I
Input leakage current, IN− and IN+ V
ID
= 0
0°C ≤ T
A
≤ 70°C 250
pA
I
CC+
Positive supply current
f
clock
= 0
T
A
= 25°C 1 2
mA
I
CC+
Positive supply current f
clock
= 0
0°C ≤ T
A
≤ 70°C 3
mA
I
CC−
Negative supply current
f
clock
= 0
T
A
= 25°C −0.8 −2
mA
I
CC−
Negative supply current f
clock
= 0
0°C ≤ T
A
≤ 70°C −3
mA
C
pd
Power dissipation capacitance See Note 2 40 pF
NOTES: 1. This is the peak-to-peak value that is not exceeded 95% of the time.
2. Factor-relating clock frequency to increase in supply current. At V
CC+
= 5 V, I
CC+
= I
CC+
(f
clock
= 0) + C
pd
× 5 V × f
clock
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