Analog to digital converter is a / D converter, or referred to as ADC, usually refers to an analog signal into a digital signal of the electronic components. The usual analog-to-digital converter converts an input voltage signal into an output digital signal. This paper introduces the circuit principle of several ADC chips.

1、AD9280

Ad9280 device is a single-chip, 8-bit, 32 MSPs analog-to-digital converter (ADC). This paper mainly introduces the characteristics, application range, reference design circuit and circuit analysis of ad9280 to help you shorten the design time.

Introduction to ad9280

The ad9280 is a single-chip, 8-bit, 32 MSPs analog-to-digital converter (ADC), powered by a single power supply, with an on-chip sample and hold amplifier and a voltage reference. It adopts multi-stage differential pipeline architecture, data rate up to 32 MSPs, no code loss in the whole operating temperature range.

Ad9280 features:

Compatible with ad876-8 pin

Power consumption: 95 MW (3 V power supply)

The operating voltage range is + 2.7V to + 5.5V

DNL error: 0.2 LSB

Power saving (sleep) mode

Ad9280 internal structure block diagram:

  

Figure 1 internal structure block diagram of ad9280 shows the internal structure

Ad9280 reference design circuit:

  

Figure 2 typical application circuit of ad9280

2、AD7541

Ad7541 device is a low-cost, high-performance 12 bit single-chip multiplication DAC. This paper mainly introduces the characteristics, application range, reference design circuit and circuit analysis of ad7541 to help you shorten the design time.

Introduction to ad7541

Ad7541a is a low cost, high performance 12 bit single chip Multiplier DAC. The device is manufactured with advanced low noise thin film CMOS technology, and is available in standard 18 pin dip and 20 pin surface mount packages. Ad7541a is compatible with industry standard device ad7541 in terms of function and pin, and the specification and performance have been improved. In addition, the device design has been improved to ensure no latch up, so there is no need to protect the Schottky diode.

Ad7541 features:

Improved version of ad7541

Complete four quadrant multiplication

12 bit linearity (endpoint)

All devices are monotonic

TTL / CMOS compatible

low cost

No need to protect Schottky diode

Low logic input leakage

Ad7541 internal structure block diagram:

  

Figure 3 shows the internal structure of ad7541

Ad7541 reference design circuit:

  

Figure 4 typical application circuit of ad7541

3、AD7694

Ad7694 is a 3-channel, low-noise, low-power, 24 bit sigma delta ADC with built-in on-chip instrument amplifier. This paper mainly introduces the characteristics, application range, reference design circuit and circuit analysis of ad7694, which helps you shorten the design time.

Introduction to ad7694

The ad7694 is a 16 bit, 250 ksps, charge redistribution, successive approximation analog-to-digital converter (ADC) powered by a 2.7 V to 5.25 V single power supply (VDD). The device has a very low power consumption, high speed, 16 bit lossless sampling ADC (class B), an internal conversion clock and a SPI compatible serial interface port. It also integrates a sample and hold circuit with low noise, wide bandwidth and very short aperture delay. At the rising edge of CNV, ad7694 samples the analog input voltage difference between in + and in -, ranging from 0V to Ref. The reference voltage (Ref) is supplied externally and can be set up to the supply voltage.

Ad7694 features:

16 bit resolution

Throughput: 250 ksps

Integral nonlinearity (inl): maximum ± 4 LSB

power waste:

800 µA @ 5V/100 kSPS

540 µA @ 2.7V/100 kSPS

Pseudo differential analog input range: 0 V ~ VREF (VREF up to VDD)

Ad7694 application:

Battery powered equipment

Medical instruments

mobile communication

Personal digital assistant

data acquisition

Instruments and Apparatuses

process control

Ad7694 reference design circuit:

  

Figure 5 typical application circuit of ad7694

 Editor’s comments:This paper mainly introduces the characteristics, application scope, reference design circuit and circuit analysis of ad9280, ad7541 and ad7694 to help you shorten the design time. The ad9280 is a single-chip, 8-bit, 32 MSPs analog-to-digital converter (ADC), powered by a single power supply, with an on-chip sample and hold amplifier and a voltage reference. Ad7541a is a low cost, high performance 12 bit single chip Multiplier DAC. The ad7694 is a 16 bit, 250 ksps, charge redistribution, successive approximation analog-to-digital converter (ADC) powered by a 2.7 V to 5.25 V single power supply (VDD).

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