AD7705, 2-Kanal 16Bit-Sigma-Delta-ADC, DIP16
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Art-Nr. AD7705BN
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2-Kanal 16-Bit Sigma-Delta-ADC

The AD7705/AD7706 are complete analog front ends for low
frequency measurement applications. These 2-/3-channel devices
can accept low level input signals directly from a transducer and
produce serial digital output. The devices employ a Σ-Δ
conversion technique to realize up to 16 bits of no missing codes
performance. The selected input signal is applied to a
proprietary, programmable-gain front end based around an
analog modulator. The modulator output is processed by an on-
chip digital filter. The first notch of this digital filter can be pro-
grammed via an on-chip control register, allowing adjustment of
the filter cutoff and output update rate.
The AD7705/AD7706 devices operate from a single 2.7 V to
3.3 V or 4.75 V to 5.25 V supply. The AD7705 features two fully
differential analog input channels; the AD7706 features three
pseudo differential input channels.
Both devices feature a differential reference input. Input signal
ranges of 0 mV to 20 mV through 0 V to 2.5 V can be
incorporated on both devices when operating with a VDD of 5 V
and a reference of 2.5 V. They can also handle bipolar input
signal ranges of ±20 mV through ±2.5 V, which are referenced to
the AIN(−) inputs on the AD7705 and to the COMMON input
on the AD7706.

3 V/5 V, 1 mW, 2-/3-Channel,
16-Bit, Sigma-Delta ADCs
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.
- AD7705: 2 fully differential input channel ADCs
- AD7706: 3 pseudo differential input channel ADCs
- 16 bits no missing codes
- 0.003% nonlinearity
- Programmable gain front end: gains from 1 to 128
- 3-wire serial interface
- SPI®-, QSPI™-, MICROWIRE™-, and DSP-compatible
- Schmitt-trigger input on SCLK
- Ability to buffer the analog input
- 2.7 V to 3.3 V or 4.75 V to 5.25 V operation
- Power dissipation 1 mW maximum @ 3 V
- Standby current 8 μA maximum
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