Product Summary

The AD7705B is a complete analog front end for low frequency measurement applications. The two-/three-channel device can accept low level input signals directly from a transducer and produce a serial digital output. The AD7705B employs a sigmadelta 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 of the AD7705B is processed by an onchip digital filter. The first notch of this digital filter can be programmed via an on-chip control register allowing adjustment of the filter cutoff and output update rate.

Parametrics

AD7705B absolute maximum ratings: (1)VDD to GND: -0.3μV to +7μV; (2)Analog Input Voltage to GND: -0.3 V to VDD + 0.3 V; (3)Reference Input Voltage to GND: -0.3 V to VDD + 0.3 V; (4)Digital Input Voltage to GND: -0.3 V to VDD + 0.3 V; (5)Digital Output Voltage to GND: -0.3 V to VDD + 0.3 V; (6)Operating Temperature Range: 0℃ to +85℃; (7)Storage Temperature Range: -5℃ to +150℃; (8)Junction Temperature: +150℃; (9)Plastic DIP Package, Power Dissipation: 450 mW; (10)qJA Thermal Impedance: 105℃/W; (11)Lead Temperature, (Soldering, 10 sec): +260℃.

Features

AD7705B features: (1)Two Fully Differential Input Channel ADCs; (2)Programmable Gain Front End Gains from 1 to 128; (3)Three-Wire Serial Interface; (4)Ability to Buffer the Analog Input; (5)2.7 V to 3.3 V or 4.75 V to 5.25 V Operation; (6)Power Dissipation 1 mW max @ 3V; (7)Standby Current 8 mA max; (8)16-Lead DIP, 16-Lead SOIC and TSSOP Packages.

Diagrams

AD7705B functional block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
AD7705BNZ
AD7705BNZ


IC ADC 16BIT 2CH 16-DIP

Data Sheet

0-1: $5.94
1-25: $4.87
25-100: $4.40
100-250: $4.04
250-500: $3.68
500-1000: $3.21
1000-2500: $3.17
AD7705BRZ-REEL7
AD7705BRZ-REEL7


IC ADC 16BIT 2CHAN 16SOIC

Data Sheet

0-1: $5.95
1-10: $5.35
10-25: $4.87
25-100: $4.40
AD7705BRZ-REEL
AD7705BRZ-REEL


IC ADC 16BIT 2CHAN 16SOIC

Data Sheet

0-1000: $3.11
AD7705BRZ
AD7705BRZ


IC ADC 16BIT 2CH 16-SOIC

Data Sheet

0-1: $5.77
1-10: $5.19
10-100: $4.27
100-250: $3.92
250-500: $3.57
500-1000: $3.11
1000-2500: $3.07
AD7705BRUZ-REEL7
AD7705BRUZ-REEL7


IC ADC 16BIT 2CHAN 16TSSOP

Data Sheet

0-1000: $3.11
AD7705BRUZ-REEL
AD7705BRUZ-REEL


IC ADC 16BIT 2CHANAN 16TSSOP

Data Sheet

0-2500: $3.07
AD7705BRUZ
AD7705BRUZ


IC ADC 16BIT 2CH 16-TSSOP

Data Sheet

0-1: $5.77
1-10: $5.19
10-100: $4.27
100-250: $3.92
250-500: $3.57
500-1000: $3.11
1000-2500: $3.07
AD7705BRU-REEL7
AD7705BRU-REEL7


IC ADC 16BIT 2CH 16-TSSOP T/R

Data Sheet

0-1000: $3.59