AD7478ART Analog Devices, AD7478ART Datasheet

AD7478ART

Manufacturer Part Number

AD7478ART

Description

Manufacturer

Analog Devices

Datasheet

1.AD7478ART.pdf (16 pages)

Specifications of AD7478ART

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SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

GENERAL DESCRIPTION

The AD7476/AD7477/AD7478 are, respectively, 12-bit, 10-bit,

and 8-bit, high-speed, low-power, successive-approximation

ADCs. The parts operate from a single 2.35 V to 5.25 V power

supply and feature throughput rates up to 1 MSPS. The parts

contain a low-noise, wide bandwidth track/hold ampliﬁer that can

handle input frequencies in excess of 1 MHz.

The conversion process and data acquisition are controlled

using CS and the serial clock, allowing the devices to interface

with microprocessors or DSPs. The input signal is sampled on

the falling edge of CS and the conversion is also initiated at this

point. There are no pipelined delays associated with the part.

The AD7476/AD7477/AD7478 use advanced design techniques

to achieve very low-power dissipation at high throughput rates.

The reference for the part is taken internally from V

allows the widest dynamic input range to the ADC. Thus the

analog input range for the part is 0 to V

is determined by the SCLK.

. The conversion rate

DD.

This

PRODUCT HIGHLIGHTS

1. First 12-/10-/8-bit ADCs in an SOT-23 package.

2. High Throughput with Low Power Consumption.

3. Flexible Power/Serial Clock Speed Management.

4. Reference derived from the power supply.

5. No Pipeline Delay.

The conversion rate is determined by the serial clock, allowing

the conversion time to be reduced through the serial clock speed

increase. This allows the average power consumption to be

reduced while not converting. The part also features a shut-

down mode to maximize power efﬁciency at lower throughput

rates. Power consumption is 1 µA max when in shutdown.

The parts feature a standard successive-approximation ADC

with accurate control of the sampling instant via a CS input

and once-off conversion control.

1 MSPS, 12-/10-/8-Bit ADCs

AD7476/AD7477/AD7478

FUNCTIONAL BLOCK DIAGRAM

AD7476/AD7477/AD7478

T/H

APPROXIMATION

SUCCESSIVE

8-/10-/12-BIT

GND

CONTROL

in 6-Lead SOT-23

LOGIC

ADC

SCLK

SDATA

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