AD7625BCPZ Datasheet, PDF (1/24 Pages) Analog Devices – 16-Bit, 6 MSPS, PulSAR Differential ADC

Data Sheet
FEATURES
Throughput: 6 MSPS
SNR: 93 dB
INL: ±0.45 LSB typical, ±1 LSB maximum
DNL: ±0.3 LSB typical, ±0.5 LSB maximum
Power dissipation: 135 mW
32-lead LFCSP (5 mm × 5 mm)
SAR architecture
No latency/no pipeline delay
16-bit resolution with no missing codes
Zero error: ±1.5 LSB
Differential input voltage: ±4.096 V
Serial LVDS interface
Self-clocked mode
Echoed-clock mode
Can use LVDS or CMOS 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
High dynamic range telecommunications
Receivers
Digital imaging systems
High speed data acquisition
Spectrum analysis
Test equipment
16-Bit, 6 MSPS, PulSAR
Differential ADC
AD7625
FUNCTIONAL BLOCK DIAGRAM
REFIN REF VCM
1.2V
BAND GAP
IN+
IN–
÷2 CLOCK
CAP
DAC
LOGIC
AD7625
SAR
SERIAL
LVDS
VIO
CNV+, CNV–
D+, D–
DCO+, DCO–
CLK+, CLK–
Figure 1.
GENERAL DESCRIPTION
The AD7625 is a 16-bit, 6 MSPS, charge redistribution successive
approximation register (SAR) based architecture analog-to-digital
converter (ADC). SAR architecture allows unmatched perfor-
mance both in noise (93 dB SNR) and in linearity (1 LSB). The
AD7625 contains a high speed, 16-bit sampling ADC, an internal
conversion clock, and an internal buffered reference. On the
CNV± rising 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 LVDS self-clocked
or echoed-clock serial interface, reducing external hardware
connections.
The AD7625 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
16
16
16
True Bipolar
16
Differential (Antiphase)
16
16
18
18
18
1 MSPS to <2 MSPS
AD7653
AD7667
AD7980
AD7983
AD7671
AD7677
AD7623
AD7643
AD7982
AD7984
2 MSPS to 3 MSPS
AD7621
AD7622
AD7641
6 MSPS
AD7625
Rev. A
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