AD7960 Datasheet, PDF (1/24 Pages) Analog Devices – 18-Bit, 5 MSPS PulSAR Differential ADC

Data Sheet
FEATURES
Throughput: 5 MSPS
18-bit resolution with no missing codes
Excellent ac and dc performance
Dynamic range: 100 dB
SNR: 99 dB
THD: −117 dB
INL: ±0.8 LSB (typical), ±2 LSB (maximum)
DNL: ±0.5 LSB (typical), ±0.99 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, 5mm × 5mm LFCSP (QFN)
APPLICATIONS
Digital imaging systems
Digital X-rays
Computed tomography
IR cameras
MRI gradient control
High speed data acquisition
Spectroscopy
Test equipment
18-Bit, 5 MSPS PulSAR
Differential ADC
AD7960
FUNCTIONAL BLOCK DIAGRAM
REFIN REF VCM VDD1 VDD2 VIO
IN+
IN–
AD7960
÷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 AD7960 is an 18-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 AD7960 contains a low power, high speed,
18-bit sampling ADC, an internal conversion clock, and an
internal reference buffer. On the CNV± edge, the AD7960
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 AD7960 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
Differential,¹ AD7653
AD7985
16-Bit
AD7667
AD7980
AD7983
True Bipolar, AD7671
16-Bit
Differential,² AD7677
AD7621
16-Bit
AD7623
AD7622
Differential,² AD7643
AD7641
18-Bit
AD7982
AD7986
AD7984
5 MSPS
to 6 MSPS 10 MSPS
AD7625
AD7961
AD7960
AD7626
1 _{Ground sense.}
2 _Antiphase.
Rev. 0
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