AD7961 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
AD7961 Datasheet PDF : 24 Pages
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Data Sheet
FEATURES
Throughput: 5 MSPS
16-bit resolution with no missing codes
Excellent ac and dc performance
Dynamic range: 96 dB
SNR: 95.5 dB
THD: −116 dB
INL: ±0.2 LSB (typical), ±0.55 LSB (maximum)
DNL: ±0.14 LSB (typical), ±0.25 LSB (maximum)
True differential analog input voltage range: ±4.096 V or ±5 V
Low power dissipation
46.5 mW at 5 MSPS with external reference buffer
(echoed clock mode)
64.5 mW at 5 MSPS with internal reference buffer
(echoed clock mode)
39 mW at 5 MSPS with external reference buffer
(self clocked mode, CNV± in CMOS mode)
SAR architecture
No latency/pipeline delay
External reference options: 2.048 V buffered to 4.096 V (internal
reference buffer), 4.096 V, and 5 V
Serial LVDS interface
Self clocked mode
Echoed clock mode
LVDS or CMOS option for conversion control (CNV± signal)
Operating temperature range of −40°C to +85°C
32-lead, 5 mm × 5 mm LFCSP (QFN)
APPLICATIONS
Digital imaging systems
Digital X-rays
Computed tomography
IR cameras
MRI gradient control
High speed data acquisition
Spectroscopy
Test equipment
16-Bit, 5 MSPS PulSAR
Differential ADC
AD7961
FUNCTIONAL BLOCK DIAGRAM
REFIN REF VCM VDD1 VDD2 VIO
IN+
IN–
AD7961
÷2 CLOCK
CAP
DAC
LOGIC
SAR
SERIAL
LVDS
EN0
EN1
EN2
EN3
CNV+, CNV–
D+, D–
DCO+, DCO–
CLK+, CLK–
GND
Figure 1.
GENERAL DESCRIPTION
The AD7961 is a 16-bit, 5 MSPS, charge redistribution successive
approximation (SAR), analog-to-digital converter (ADC). The
SAR architecture allows unmatched performance both in noise
and in linearity. The AD7961 contains a low power, high speed,
16-bit sampling ADC, an internal conversion clock, and an
internal reference buffer. On the CNV± edge, the AD7961
samples the voltage difference between the IN+ and IN− pins.
The voltages on these pins swing in opposite phase between 0 V
and 4.096 V and between 0 V and 5 V. The reference voltage is
applied to the part externally. All conversion results are available
on a single LVDS self clocked or echoed clock serial interface.
The AD7961 is available in a 32-lead LFCSP (QFN) with
operation specified from −40°C to +85°C.
Table 1. Fast PulSAR® ADC Selection
Input Type
1 MSPS to 2 MSPS to
<2 MSPS 3 MSPS
Pseudo-
Differential,
16-Bit
AD7653
AD7667
AD7980
AD7985
AD7983
True Bipolar, AD7671
16-Bit
Differential,1
16-Bit
AD7677
AD7623
AD7621
AD7622
Differential,1
18-Bit
AD7643
AD7982
AD7641
AD7986
AD7984
5 MSPS
to 6 MSPS 10 MSPS
AD7625
AD7961
AD7960
AD7626
1 Antiphase.
Rev. B
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