AD7625 Datasheet, PDF (1/11 Pages) Analog Devices – 16-Bit, 6MSPS PulSAR Differential ADC

Preliminary Technical Data
FEATURES
Throughput: 6 MSPS
SAR architecture
16-bit resolution with no missing codes
SNR: 92 dB Typ, 90dB Min @ 1MHz
INL: ±1 LSB Typ, ±2 LSB Max
DNL: ±0.3 LSB Typ, ±1 LSB Max
Differential input range: ± 4.096V
No latency/no pipeline delay (SAR architecture)
Serial LVDS interface:
Self-clocked mode
Echoed-clock mode
Reference:
Internal 4.096 V
External (1.2V) buffered to 4.096 V
External 4.096 V
Power dissipation 150 mW
32-Lead LFCSP package (5 mm x 5 mm)
APPLICATIONS
High dynamic range telecommunications
Receivers
Digital imaging systems
High-speed data acquisition
Spectrum analysis
Test equipment
Table 1. Fast PulSAR ADC Selection
Res
Input Type (Bit
s)
≥1 MSPS
to
< 2MSPS
≥ 2 MSPS
to
≤ 3 MSPS
Differential 16 AD7653
AD7985
(ground
sense)
AD7667
AD7980
AD7983
True Bipolar 16 AD7671
Differential 16
(anti-phase)
AD7677
AD7623
AD7621
AD7622
Differential 18 AD7643
AD7641
(anti-phase)
AD7982
AD7986
AD7984
6 MSPS
AD7625
10
MSPS
AD7626
16-Bit, 6MSPS PulSAR
Differential ADC
AD7625
FUNCTIONAL BLOCK DIAGRAM
REFIN REF VCM
1.2V
BANDGAP
2
IN+
CAP DAC
IN-
CLOCK
AD7626
SAR
LOGIC
SERIAL
LVDS
VIO
CNV
D
DCO
CLK
Figure 1.
GENERAL DESCRIPTION
The AD7625 is a 16-bit, 6MSPS, charge redistribution successive
approximation register (SAR) architecture, analog-to-digital
converter (ADC). SAR architecture allows unmatched
performance both in noise – 92dB SNR - and in linearity –
1LSB. The AD7625 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
IN+ and IN− pins. The voltages on these pins swing in opposite
phase between 0 V and REF. The 4.096V 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 LFCSP (5mm by 5mm) with
operation specified from −40°C to +85°C.
Rev. PrB
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