ADC. AD7626 Datasheet

AD7626 Datasheet PDF


Part

AD7626

Description

PulSAR Differential ADC

Manufacture

Analog Devices

Page 29 Pages
Datasheet
Download AD7626 Datasheet


AD7626 Datasheet
Data Sheet
16-Bit, 10 MSPS, PulSAR
Differential ADC
AD7626
FEATURES
Throughput: 10 MSPS
SNR: 91.5 dB
16-bit no missing codes
INL: ±0.45 LSB
DNL: ±0.35 LSB
Power dissipation: 136 mW
32-lead LFCSP (5 mm × 5 mm)
SAR architecture
No latency/pipeline delay
16-bit resolution with no missing codes
Zero error: ±1 LSB
Differential input range: ±4.096 V
Serial LVDS interface
Self clocked mode
Echoed clock mode
LVDS or CMOS option for conversion control (CNV signal)
Reference options
Internal: 4.096 V
External (1.2 V) buffered to 4.096 V
External: 4.096 V
APPLICATIONS
Digital imaging systems
Digital X-ray
Digital MRI
CCD and IR cameras
High speed data acquisition
High dynamic range telecommunications receivers
Spectrum analysis
Test equipment
FUNCTIONAL BLOCK DIAGRAM
REFIN REF VCM
1.2V
BAND GAP
IN+
IN–
÷2 CLOCK
CAP
DAC
AD7626
SAR
LOGIC
SERIAL
LVDS
VIO
CNV+, CNV–
D+, D–
DCO+, DCO–
CLK+, CLK–
Figure 1.
GENERAL DESCRIPTION
The AD7626 is a 16-bit, 10 MSPS, charge redistribution
successive approximation register (SAR) based architecture
analog-to-digital converter (ADC). SAR architecture allows
unmatched performance both in noise (91.5 dB SNR) and in
linearity (±0.45 LSB INL). The AD7626 contains a high speed,
16-bit sampling ADC, an internal conversion clock, and an
internal buffered reference. On the CNV edge, it samples the
voltage difference between the IN+ and IN− pins. The voltages
on these pins swing in opposite phase between 0 V and REF.
The 4.096 V reference voltage, REF, can be generated internally
or applied externally.
All converted results are available on a single low voltage
differential signaling (LVDS) self clocked or echoed clock serial
interface, reducing external hardware connections.
The AD7626 is housed in a 32-lead, 5 mm × 5 mm LFCSP with
operation specified from −40°C to +85°C.
Table 1. Fast PulSAR® ADC Selection
Input Type
Resolution (Bits)
Differential (Ground Sense) 16
True Bipolar
Differential (Antiphase)
Differential (Antiphase)
16
16
18
1 MSPS to <2 MSPS
AD7653
AD7667
AD7980
AD7983
AD7671
AD7677
AD7623
AD7643
AD7982
AD7984
2 MSPS to 3 MSPS
AD7985
AD7621
AD7622
AD7641
AD7986
5 MSPS to 6 MSPS
AD7625
AD7961
AD7960
10 MSPS
AD7626
Rev. D
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AD7626 Datasheet
AD7626
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 6
Timing Diagrams.......................................................................... 7
Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 11
Terminology .................................................................................... 15
REVISION HISTORY
4/16—Rev. C to Rev. D
Changes to Internal Reference Parameter, Table 2....................... 4
Added Acquisition Time Parameter, Table 3 ................................ 6
Change to Table 5 ............................................................................. 8
Change to Figure 32 Caption and Figure 33 Caption................ 19
10/15—Rev. B to Rev. C
Changes to Table 1............................................................................ 1
Added Aperture Delay Parameter and Current Drain
Parameter, Table 2............................................................................. 3
Changes to Ordering Guide .......................................................... 26
Data Sheet
Theory of Operation ...................................................................... 16
Circuit Information.................................................................... 16
Converter Information .............................................................. 16
Transfer Functions ..................................................................... 17
Analog Inputs.............................................................................. 17
Typical Connection Diagram ................................................... 18
Driving the AD7626................................................................... 19
Voltage Reference Options........................................................ 21
Power Supply............................................................................... 22
Digital Interface .......................................................................... 23
Applications Information .............................................................. 25
Layout, Decoupling, and Grounding....................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 26
7/12—Rev. A to Rev. B
Changed CP-32-2 Package to CP-32-7 Package.............Universal
Changes to Figure 4...........................................................................8
Updated Outline Dimensions ...................................................... 25
Changes to Ordering Guide .......................................................... 25
1/10—Rev. 0 to Rev. A
Changes to Description of Pin 5 and Pin 6, Table 6 .....................8
Changes to Power-Up Section ...................................................... 21
9/09—Revision 0: Initial Version
Rev. D | Page 2 of 29


Features Datasheet pdf 16-Bit, 10 MSPS, PulSAR Differential ADC AD7626 FEATURES Throughput: 10 MSPS SN R: 91.5 dB 16-bit no missing codes INL: ±0.45 LSB DNL: ±0.35 LSB Power dissi pation: 136mW 32-lead LFCSP (5 mm × 5 mm) SAR architecture No latency/no pipe line delay 16-bit resolution with no mi ssing codes Zero error: ±1LSB Differen tial input range: ±4.096 V Serial LVDS interface Self-clocked mode Echoed-clo ck mode LVDS or CMOS option for convers ion control (CNV signal) Reference opti ons Internal: 4.096 V External (1.2 V) buffered to 4.096 V External: 4.096 V FUNCTIONAL BLOCK DIAGRAM REFIN REF VCM 1.2V BAND GAP IN+ IN– CAP DAC VIO LOG IC CNV+, CNV– D+, D– CLK+, CLK– 0 7648-001 ÷2 CLOCK AD7626 SAR SERI AL LVDS DCO+, DCO– Figure 1. GENER AL DESCRIPTION The AD7626 is a 16-bit, 10 MSPS, charge redistribution successi ve approximation register (SAR) based a rchitecture analog-to-digital converter (ADC). SAR architecture allows unmatch ed performance both in noise (91.5 dB SNR) and in linearity (±0.45 LSB INL). Th.
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