Differential Input, Dual, Simultaneous

Sampling, 3 MSPS, 12-Bit, SAR ADC

Data Sheet

AD7352

Rev. B

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FEATURES

Dual 12-bit SAR ADC

Simultaneous sampling

Throughput rate: 3 MSPS per channel

No conversion latency

Power dissipation: 26 mW at 3 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

AD7352

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 AD73521 is a dual, 12-bit, high speed, low power, successive

approximation ADC that operates from a single 2.5 V power

supply and features throughput rates up to 3 MSPS. The part

contains two ADCs, each preceded by a low noise, wide band-

width track-and-hold circuit that can handle input frequencies

in excess of 110 MHz.

The conversion process and data acquisition use standard

control inputs allowing for easy interfacing to microprocessors

or DSPs. The input signal is sampled on the falling edge of CS;

and a conversion is also initiated at this point. The conversion

time is determined by the SCLK frequency.

The AD7352 uses advanced design techniques to achieve very

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

supply and a 3 MSPS throughput rate, the part consumes 10 mA

typically. The part also offers a flexible power/throughput rate

management options.

The analog input range for the part is the differential common-

that can be overdriven when an external reference is preferred.

The AD7352 is available in a 16-lead thin shrink small outline

package (TSSOP).

PRODUCT HIGHLIGHTS

1. Two Complete ADC Functions.

These functions allow simultaneous sampling and conversion

of two channels. The conversion result of both channels is

simultaneously available on separate data lines or in suc-

cession on one data line if only one serial port is available.

2. High Throughput With Low Power Consumption.

The AD7352 offers a 3 MSPS throughput rate with 26 mW

power consumption.

3. No Conversion Latency.

The AD7352 features two standard successive

approximation 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

AD7356

12-bit

5 MSPS

Differential

AD7357

14-bit

4.2MSPS

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.