Differential Input, Dual, Simultaneous

Sampling, 5 MSPS, 12-Bit, SAR ADC

Data Sheet

AD7356

Rev. B

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FEATURES

Dual 12-bit SAR ADC

Simultaneous sampling

Throughput rate: 5 MSPS per channel

No conversion latency

Power dissipation: 36 mW at 5 MSPS

On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C

Dual conversion with read

High speed serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP-

compatible

−40°C to +125°C operation

Available in a 16-lead TSSOP

APPLICATIONS

Data acquisition systems

Motion control

I and Q demodulation

FUNCTIONAL BLOCK DIAGRAM

SCLK

AD7356

12-BIT

SUCCESSIVE

APPROXIMATION

ADC

12-BIT

SUCCESSIVE

APPROXIMATION

ADC

CONTROL

LOGIC

CS

DGND

REFGND

AGND

AGND

T/H

T/H

BUF

BUF

REF

Figure 1.

GENERAL DESCRIPTION

The AD73561 is a dual, 12-bit, high speed, low power, successive

approximation ADCthat operatesfroma single 2.5 V power

supply and featuresthroughput rates up to 5 MSPS. The device

contains twoADCs, eachprecededbya lownoise,widebandwidth

track-and-hold circuit thatcan handleinput frequenciesin excess

of 110 MHz.

The conversionprocess anddata acquisition use standardcontrol

inputs allowing for easy interfacing to microprocessors orDSPs.

The input signal is sampledonthefalling edgeofCS; a conversion

is also initiated at this point. The conversion time is determined

by the SCLK frequency.

The AD7356 uses advanced design techniques to achievevery

low power dissipation at high throughput rates. With a 2.5 V

supply and a 5 MSPSthroughputrate,thepart consumestypically

14 mA. The part also offers a flexible power/throughputrate

management option.

The analog input range for the partis the differential common

that can be overdriven when an external reference is preferred.

The AD7356 is available in a 16-lead thin shrinksmall outline

package (TSSOP).

PRODUCT HIGHLIGHTS

1. Two CompleteADC Functions.

These functionsallowsimultaneoussampling and conversion

of two channels. The conversion result of both channels

is simultaneously available on separatedata lines or in

succession on one data line if only one serial port is

available.

2. High Throughput with Low Power Consumption.

The AD7356 offers a 5 MSPS throughput rate with 36 mW

power consumption.

3. No Conversion Latency.

The AD7356 featurestwostandardsuccessiveapproximation

ADCs with accurate control of the sampling instant via a

CS input and, once off, conversion control.

Table 1. Related Devices

Generic

Resolution

Throughput Analog Input

AD7352

12-bit

3 MSPS

Differential

AD7357

14-bit

4.25 MSPS

Differential

AD7266

12-bit

2 MSPS

Differential/single ended

AD7866

12-bit

1 MSPS

Single-ended

AD7366

12-bit

1 MSPS

Single-ended bipolar

AD7367

14-bit

1 MSPS

Single-ended bipolar

1

Protected by U.S. Patent No. 6,681,332.