ICL7135高精度A/D转换器：英文资料详解

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ICL7135是一款由Intersil公司生产的高精度4位半二进制编码输出模拟数字转换器(A/D Converter)。这款器件在数字万用表(DVM)和数字比例计(DPM)市场中具有显著优势，因为它结合了双斜率转换技术的可靠性与±1 in 20,000计数的高精度，能够实现真正的比率测量和极佳的线性度。该芯片的最大特点是其2.0000伏全量程能力，具备自动零点调整功能，可以实现自动极性控制，确保测量结果准确无误。所有必要的活性元件，如除显示器驱动、参考电压源和时钟外，都被集成在一个单一的CMOS集成电路内，这使得ICL7135在紧凑的设计中提供了经济高效的解决方案。 ICL7135的独特之处在于其自动零点误差低至10微伏，零漂移小于1微伏每摄氏度，输入偏置电流仅为10皮安培（最大值），并且滚动误差小于一个计数单位。这使得它在各种应用中表现出高度的稳定性和准确性。此外，其采用多路复用BCD输出设计，增加了更多的灵活性。通过添加诸如STROBE(脉冲)、OVERRANGE(超限)、UNDERRANGE(欠限)、RUN/HOLD(运行/保持)和BUSY(忙)等信号线，使得ICL7135能够与微处理器或通用异步接收器(UART)轻松接口，支持更复杂系统的集成。这使得用户可以根据需要灵活配置和控制转换过程，提高了系统的整体性能。 ICL7135凭借其卓越的性能、广泛的接口选项以及经济的封装形式，是工业和消费电子设备中理想的选择，尤其适用于那些对测量精确度要求高的应用场合，例如精密仪表、自动化测试设备或需要与智能设备通信的设备。它的这些特性使得它在当今数字化和自动化趋势中占据了一席之地。

FN3093.3

Absolute Maximum Ratings Thermal Information

Supply Voltage V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6V

V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -9V

Analog Input Voltage (Either Input) (Note 1) . . . . . . . . . . . . V+ to V-

Reference Input Voltage (Either Input). . . . . . . . . . . . . . . . . V+ to V-

Clock Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to V+

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

C to 70

Thermal Resistance (Typical, Note 2) . . . . . . . . . . . . . θ

(

C/W)

PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .150

Maximum Storage Temperature Range. . . . . . . . . . -65

C to 150

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300

NOTE: Pb-free PDIPs can be used for through hole wave solder

processing only. They are not intended for use in Reflow solder

processing applications.

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1. Input voltages may exceed the supply voltages provided the input current is limited to +100µA.

2. θ

is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

Electrical Specifications V+ = +5V, V- = -5V, T

= 25

C, f

CLK

Set for 3 Readings/s, Unless Otherwise Specified

PARAMETER TEST CONDITIONS

MIN TYP MAX UNITS

ANALOG (Notes 3, 4)

Zero Input Reading V

= 0V, V

REF

= 1.000V -00000 +00000 +00000 Counts

Ratiometric Error (Note 4) V

= V

REF

= 1.000V -3 0 +3 Counts

Linearity Over ± Full Scale (Error of Reading from Best Straight Line) -2V ≤ V

≤ +2V - 0.5 1 LSB

Differential Linearity (Difference Between Worse Case Step of

Adjacent Counts and Ideal Step)

-2V ≤ V

≤ +2V - 0.01 - LSB

Rollover Error (Difference in Reading for Equal Positive and

Negative Voltage Near Full Scale)

-V

≡ +V

≈ 2V - 0.5 1 LSB

Noise (Peak-to-Peak Value Not Exceeded 95% of Time), e

= 0V, Full scale = 2.000V - 15 - µV

Input Leakage Current, I

ILK

= 0V - 1 10 pA

Zero Reading Drift (Note 7) V

= 0V, 0

C to 70

C - 0.5 2 µV/

Scale Factor Temperature Coefficient, T

(Notes 5 and 7) V

= +2V, 0

C to 70

Ext. Ref. 0ppm/

- 2 5 ppm/×

DIGITAL INPUTS

Clock In, Run/Hold (See Figure 2) V

INH

2.8 2.2 - V

INL

- 1.6 0.8 V

INL

= 0V - 0.02 0.1 mA

INH

= +5V - 0.1 10 µA

DIGITAL OUTPUTS

All Outputs, V

= 1.6mA - 0.25 0.40 V

B1 , B2 , B4 , B8 , D1 , D2 , D3 , D4 , D5 , V

= -1mA 2.4 4.2 - V

BUSY, STROBE, OVERRANGE, UNDERRANGE, POLARITY, V

= -10µA 4.9 4.99 - V

SUPPLY

+5V Supply Range, V+ +4 +5 +6 V

-5V Supply Range, V- -3 -5 -8 V

+5V Supply Current, I+ f

= 0 - 1.1 3.0 mA

-5V Supply Current, I- f

= 0 - 0.8 3.0 mA

Power Dissipation Capacitance, C

vs Clock Frequency - 40 - pF

CLOCK

Clock Frequency (Note 6) DC 2000 1200 kHz

NOTES:

3. Tested in 4

digit (20.000 count) circuit shown in Figure 3. (Clock frequency 120kHz.)

4. Tested with a low dielectric absorption integrating capacitor, the 27Ω INT OUT resistor shorted, and R

lNT

= 0. See Component Value Selection Discussion.

5. The temperature range can be extended to 70

C and beyond as long as the auto-zero and reference capacitors are increased to absorb the higher leakage

of the ICL7135.

6. This specification relates to the clock frequency range over which the lCL7135 will correctly perform its various functions See “Max Clock Frequency”

section for limitations on the clock frequency range in a system.

7. Parameter guaranteed by design or characterization. Not production tested.

ICL7135

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