AD7680

a

REV. PrE

11/02

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Analog Devices, Inc., 2002

3mW, 100kSPS,

16-Bit ADC in 6 Lead SOT-23

Preliminary Technical Data

PRELIMINARY TECHNICAL DATA

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Fast Throughput Rate: 100kSPS

Low Power:

2.5mW typ at 100kSPS with 3V Supplies

15mW typ at 100kSPS with 5V Supplies

Wide Input Bandwidth:

85dB SNR at 10kHz Input Frequency

Flexible Power/Serial Clock Speed Management

No Pipeline Delays

High Speed Serial Interface

SPI/QSPI/

µµµµµWire/DSP Compatible

6-Lead SOT-23, and 8-Lead MSOP Packages

APPLICATIONS

Battery-Powered Systems

Personal Digital Assistants

Medical Instruments

Mobile Communications

Instrumentation and Control Systems

Remote Data Acquisition Systems

High-Speed Modems

Optical Sensors

GENERAL DESCRIPTION

The AD7680 is a 16-bit, fast, low power, successive-ap-

proximation ADC. The part operates from a single 2.5 V

to 5.25 V power supply and features throughput rates up

to 100kSPS. The part contains a low-noise, wide band-

width track/hold amplifier which can handle input fre-

quencies in excess of 100kHz.

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 AD7860 uses advanced design techniques to achieve

very low-power dissipation at fast throughput rates.

This allows the widest dynamic input range to the ADC.

conversion rate is determined by the SCLK frequency.

PRODUCT HIGHLIGHTS

1. First 16-Bit ADC in a SOT-23 package.

2. High Throughput with Low Power Consumption

3. Flexible Power/Serial Clock Speed Management

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 when a powerdown mode is

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

down mode to maximize power efficiency at lower

throughput rates. Power consumption is 0.5

µA max

when in shutdown.

4. Reference derived from the power supply.

5. No Pipeline Delay

The part features a standard successive-approximation

ADC with accurate control of the sampling instant via a

CS input and once off conversion control.

T/H

VIN

AD7680

VDD

16-BIT SUCCESSIVE

APPROXIMATION

ADC

SCLK

CONTROL LOGIC

SDATA

+5

GND