AD7993/AD7994：4通道I2C接口的10/12位高精度ADC

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本文档是关于AD7993/AD7994型号的四通道10-和12位模拟到数字转换器（ADC）的数据手册。这些器件的特点包括： 1. **高性能转换**：AD7993/AD7994提供了快速的转换速度，典型值为2微秒，适合对实时数据采集有高要求的应用。 2. **多通道设计**：每个设备拥有4个独立的单端模拟输入通道，能够同时处理多个信号，增加了数据处理的灵活性。 3. **宽工作电压范围**：这些ADC被设计为在2.7V至5.5V的VDD电压范围内工作，确保了在多种电源条件下都能稳定运行。 4. **低功耗**：为了延长电池寿命或在能源受限的系统中优化性能，AD7993/AD7994注重节能，具有较低的功耗特性。 5. **高速数据流**：通过188千次样本每秒（kSPS）的高吞吐率，可以快速处理大量模拟信号，适合实时数据分析或采样密集型应用。 6. **温度兼容性**：器件的工作温度范围覆盖了从-40°C到+125°C，能够在各种环境条件下保持稳定表现。 7. **序列操作**：内部序列器功能使得数据采集过程可以按照预定的顺序进行，方便系统设计。 8. **I2C接口兼容**：支持I2C通信标准，提供了标准、快速和高速三种模式，方便与微控制器等其他I2C设备通信，简化了外围连接。 9. **错误检测与报警**：具备出界指示或报警机制，当输入信号超出设定范围时，可以自动报告异常，提高系统的鲁棒性。 10. **版权信息**：文档由Analog Devices公司提供，所有权利保留，且声明了关于专利权和责任的注意事项。总结来说，AD7993/AD7994是一款适用于工业控制、信号处理、嵌入式系统等领域的高性能ADC，它结合了高速转换、低功耗和灵活的I2C接口，是现代电子设计中不可或缺的组件。在实际项目中，设计师需要考虑其规格要求，确保选择和使用恰当，以满足具体应用的需求。

AD7993/AD7994

Rev. 0 | Page 6 of 32

Parameter B Version Unit Test Conditions/Comments

LOGIC INPUTS (CONVST)

Input High Voltage, V

INH

2.4 V min V

= 5 V

2.0 V min V

= 3 V

Input Low Voltage, V

INL

0.8 V max V

= 5 V

0.4 V max V

= 3 V

Input Leakage Current, I

±1 µA max V

= 0 V or V

Input Capacitance, C

10 pF max

LOGIC OUTPUTS (OPEN-DRAIN)

Output Low Voltage, V

0.4 V max I

SINK

= 3 mA

0.6 V max I

SINK

= 6 mA

Floating-State Leakage Current ±1 µA max

Floating-State Output Capacitance

10 pF max

Output Coding Straight (Natural) Binary

CONVERSION RATE See the Serial Interface section

Conversion Time 2 µs typ

Throughput Rate

Mode 1 (Reading after the Conversion) 5 kSPS typ f

SCL

= 100 kHz

21 kSPS typ f

SCL

= 400 kHz

121 kSPS typ f

SCL

= 3.4 MHz

Mode 2 5.5 kSPS typ f

SCL

= 100 kHz

22 kSPS typ f

SCL

= 400 kHz

147 kSPS typ f

SCL

= 3.4 MHz , 188 kSPS typ @ 5 V

POWER REQUIREMENTS

2.7/5.5 V min/max

Digital inputs = 0 V or V

Power-Down Mode, Interface Inactive 1/2 µA max V

= 3.3 V/5.5 V

Power-Down Mode, Interface Active 0.07/0.3 mA max V

= 3.3 V/5.5 V, 400 kHz f

SCL

0.3/0.6 mA max V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Operating, Interface Inactive 0.06/0.1 mA max V

= 3.3 V/5.5 V, 400 kHz f

SCL

0.3/0.6 mA max V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Operating, Interface Active 0.15/0.4 mA max V

= 3.3 V/5.5 V, 400 kHz f

SCL

0.6/1.1 mA max V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Mode 1

0.7/1.4 mA typ V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Mode 2

Mode 3 (I

C Inactive, T

CONVERT

x 32) 0.7/1.5 mA max V

= 3.3 V/5.5 V

POWER DISSIPATION

Fully Operational

Operating, Interface Active 0.495/2.2 mW max V

= 3.3 V/5.5 V, 400 kHz f

SCL

1.98/6.05 mW max V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Mode 1

2.31/7.7 mW typ V

= 3.3 V/5.5 V, 3.4 MHz f

SCL

Mode 2

Power-Down, Interface Inactive 3.3/11 µW max V

= 3.3 V/5.5 V

Min/max AC dynamic performance, INL and DNL specifications are typical specifications when operating in Mode 2 with I

C high speed mode SCL frequencies.

Specifications outlined for Mode 2 apply to Mode 3 also. Sample delay and bit trial delay enabled.

See the section. Terminology

Guaranteed by initial characterization.

AD7993/AD7994

Rev. 0 | Page 7 of 32

C TIMING SPECIFICATIONS

Guaranteed by initial characterization. All values measured with input filtering enabled. C

refers to capacitive load on the bus line.

tr and tf measured between 0.3 V

and 0.7 V

High speed mode timing specifications apply to the AD7993-1/AD7994-1 only. Standard and fast mode timing specifications apply to

both the AD7993-0/AD7994-0 and the AD7993-1/AD7994-1. See Figure 2.

Unless otherwise noted, V

= 2.7 V to 5.5 V; REF

= 2.5 V; T

MIN

to T

MAX

Table 3.

AD7993/AD7994

Limit at T

MIN

, T

MAX

Parameter Conditions Min Max Unit Description

SCL

Standard mode 100 kHz Serial clock frequency

Fast mode 400 kHz

High speed mode

= 100 pF max 3.4 MHz

= 400 pF max 1.7 MHz

Standard mode 4 µs t

HIGH

, SCL high time

Fast mode 0.6 µs

High speed mode

= 100 pF max 60 ns

= 400 pF max 120 ns

Standard mode 4.7 µs t

LOW

, SCL low time

Fast mode 1.3 µs

High speed mode

= 100 pF max 160 ns

= 400 pF max 320 ns

Standard mode 250 ns t

SU;DAT

, data setup time

Fast mode 100 ns

High speed mode 10 ns

Standard mode 0 3.45 µs t

HD;DAT

, data hold time

Fast mode 0 0.9 µs

High speed mode

= 100 pF max 0 70

= 400 pF max 0 150 ns

Standard mode 4.7 µs t

SU;STA

, setup time for a repeated start condition

Fast mode 0.6 µs

High speed mode 160 ns

Standard mode 4 µs t

HD;STA

, hold time (repeated) start condition

Fast mode 0.6 µs

High speed mode 160 ns

Standard mode 4.7 µs

BUF

, bus free time between a stop and a start

condition

Fast mode 1.3 µs

Standard mode 4 µs t

SU;STO

, setup time for stop condition

Fast mode 0.6 µs

High speed mode 160 ns

Standard mode 1000 ns t

RDA

, rise time of SDA signal

Fast mode 20 + 0.1 C

300 ns

High speed mode

= 100 pF max 10 80 ns

= 400 pF max 20 160 ns

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