Datasheet AD7961 (Analog Devices)

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16-Bit, 5 MSPS PulSAR Differential ADC Data Sheet AD7961 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput: 5 MSPS REFIN REF VCM VDD1 VDD2 VIO 16-bit resolution with no missing codes EN0 Excellent ac and dc performance EN1 Dynamic range: 96 dB ÷2 CLOCK LOGIC EN2 SNR: 95.5 dB EN3 IN+ THD: −116 dB CAP CNV+, CNV– IN– DAC INL: ±0.2 LSB (typical), ±0.55 LSB (maximum) D+, D– DNL: ±0.14 LSB (typical), ±0.25 LSB (maximum) SERIAL SAR DCO+, DCO– True differential analog input voltage range: ±4.096 V or ±5 V LVDS AD7961 CLK+, CLK– Low power dissipation
001
46.5 mW at 5 MSPS with external reference buffer GND
10888-
(echoed clock mode)
Figure 1.
64.5 mW at 5 MSPS with internal reference buffer GENERAL DESCRIPTION (echoed clock mode)
The AD7961 is a 16-bit, 5 MSPS, charge redistribution successive
39 mW at 5 MSPS with external reference buffer
approximation (SAR), analog-to-digital converter (ADC). The
(self clocked mode, CNV± in CMOS mode)
SAR architecture al ows unmatched performance both in noise
SAR architecture
and in linearity. The AD7961 contains a low power, high speed,
No latency/pipeline delay
16-bit sampling ADC, an internal conversion clock, and an
External reference options: 2.048 V buffered to 4.096 V (internal
internal reference buffer. On the CNV± edge, the AD7961
reference buffer), 4.096 V, and 5 V
samples the voltage difference between the IN+ and IN− pins.
Serial LVDS interface
The voltages on these pins swing in opposite phase between 0 V
Self clocked mode
and 4.096 V and between 0 V and 5 V. The reference voltage is
Echoed clock mode
applied to the part external y. All conversion results are available
LVDS or CMOS option for conversion control (CNV± signal)
on a single LVDS self clocked or echoed clock serial interface.
Operating temperature range of −40°C to +85°C 32-lead, 5 mm × 5 mm LFCSP (QFN)
The AD7961 is available in a 32-lead LFCSP (QFN) with operation specified from −40°C to +85°C.
APPLICATIONS Digital imaging systems Table 1. Fast PulSAR® ADC Selection Digital X-rays 1 MSPS to 2 MSPS to 5 MSPS Input Type <2 MSPS 3 MSPS to 6 MSPS 10 MSPS Computed tomography
Pseudo- AD7653 AD7985
IR cameras
Differential, AD7667
MRI gradient control
16-Bit AD7980
High speed data acquisition
AD7983
Spectroscopy
True Bipolar, AD7671
Test equipment
16-Bit Differential,1 AD7677 AD7621 AD7625 AD7626 16-Bit AD7623 AD7622 AD7961 Differential,1 AD7643 AD7641 AD7960 18-Bit AD7982 AD7986 AD7984 1 Antiphase.
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Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Timing Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Circuit Information Converter Information Transfer Function Analog Inputs Typical Applications Voltage Reference Options Wake-Up Time from Power-Down and Snooze Modes Power Supply Power-Up Digital Interface Conversion Control Echoed Clock Interface Mode Self Clocked Mode Applications Information Layout Evaluating AD7961 Performance Outline Dimensions Ordering Guide