AD7708BRUZ Analog Devices Inc, AD7708BRUZ Datasheet - Page 2

• Manufacturer Part Number: AD7708BRUZ
• Description: IC ADC 16BIT R-R 8/10CH 28-TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7708BRUZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 16
• Sampling Rate (per Second): 1.37k
• Number Of Converters: 1
• Power Dissipation (max): 3.84mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 16bit
• Sampling Rate: 1.4kSPS
• Input Channel Type: Differential, Single Ended
• Supply Current: 1.1mA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 28
• Number Of Elements: 1
• Resolution: 16Bit
• Architecture: Delta-Sigma
• Sample Rate: 1.365KSPS
• Input Polarity: Bipolar
• Input Type: Voltage
• Rated Input Volt: ±2.56V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 3/5V
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Integral Nonlinearity Error: ±15ppm of FSR
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Package Type: TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7708EBZ - BOARD EVAL FOR AD7708
• Lead Free Status / Rohs Status: Compliant

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FUNCTIONAL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
AD7718 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 3
AD7708 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 6
TIMING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . 9
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . 10
ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 12
PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ADC CIRCUIT INFORMATION . . . . . . . . . . . . . . . . . . . 15
ADC NOISE PERFORMANCE CHOP ENABLED
ADC NOISE PERFORMANCE CHOP DISABLED
ON-CHIP REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Communications Register . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mode Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Characteristics when Addressing the
ADC Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Filter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
I/O Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
ADC Data Result Register . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Unipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bipolar Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ADC Offset Calibration Coefficient Registers . . . . . . . . . . . 31
ADC Gain Calibration Coefficient Register . . . . . . . . . . . . . 31
ID Register (ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
AD7708/AD7718
Signal Chain Overview (CHOP Enabled, CHOP = 0) . . . 15
(CHOP = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Signal Chain Overview (CHOP Disabled CHOP = 1) . . . 19
(CHOP = 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Mode and Control Registers . . . . . . . . . . . . . . . . . . . . . . . 28
TABLE OF CONTENTS
User Nonprogrammable Test Registers . . . . . . . . . . . . . . . . 31
Configuring the AD7708/AD7718 . . . . . . . . . . . . . . . . . . . . 32
DIGITAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
MICROCOMPUTER/MICROPROCESSOR
AD7708/AD7718 to 68HC11 Interface . . . . . . . . . . . . . . . . 34
AD7708/AD7718-to-8051 Interface . . . . . . . . . . . . . . . . . . 35
AD7708/AD7718-to-ADSP-2103/ADSP-2105 Interface . . . 36
BASIC CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . 36
Analog Input Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Single-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chop Mode of Operation (CHOP = 0) . . . . . . . . . . . . . . . . 37
Nonchop Mode of Operation (CHOP = 1) . . . . . . . . . . . . . 38
Programmable Gain Amplifier . . . . . . . . . . . . . . . . . . . . . . . 38
Bipolar/Unipolar Configuration . . . . . . . . . . . . . . . . . . . . . . 38
Data Output Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Oscillator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
RESET Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Programmable Logic Controllers . . . . . . . . . . . . . . . . . . . . . 41
Converting Single-Ended Inputs. . . . . . . . . . . . . . . . . . . . . 42
Combined Ratiometric and Absolute Value
Optimizing Throughput while Maximizing 50 Hz
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 44
INTERFACING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Measurement System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
and 60 Hz Rejection in a Multiplexed Data
Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43