AD7625 Analog Devices, AD7625 Datasheet - Page 17

• Manufacturer Part Number: AD7625
• Description: 16-Bit, 6MSPS PulSAR Differential ADC
• Manufacturer: Analog Devices

Specifications of AD7625

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 6MSPS
• Interface: LVDS,Ser
• Analog Input Type: Diff-Uni
• Ain Range: Bip 4.096V
• Adc Architecture: SAR
• Pkg Type: CSP

VOLTAGE REFERENCE OPTIONS
The AD7625 allows flexible options for creating and buffering
the reference voltage. The AD7625 conversions refer to 4.096 V
only. The various options creating this 4.096 V reference are
controlled by the EN1 and EN0 pins (see Table 8).
AND REFERENCE BUFFER. CONNECT THE
DISABLES THE INTERNAL REFERENCE
V+
SETTING EN1 = 1 AND EN0 = 0
BUFFERED 4.096V SIGNAL TO
ADR434
ADR444
THE REF PIN.
V+
V–
C
IN–
IN+
10µF
Figure 25. Voltage Reference Options
REF
AD7625
Rev. 0 | Page 17 of 24
REFIN
A
10µF
SETTING EN1 = 1 AND EN0 = 1 ENABLES THE INTERNAL
REFERENCE AND REFERENCE BUFFER. DECOUPLE
THE REF AND REFIN PINS EXTERNALLY.
Table 8. Voltage Reference Options
Option
A
B
C
1
EN1 = 0 and EN0 = 0 is an illegal state.
B
SETTING EN1 = 0 AND EN0 = 1
DISABLES THE INTERNAL REFERENCE
AND ENABLES THE INTERNAL REFERENCE BUFFER.
CONNECT A 1.2V REFERENCE TO THE REFIN PIN. THE 1.2V
APPLIED TO THE REFIN PIN IS BUFFERED INTERNALLY
TO CREATE A 4.096V REFERENCE FOR THE ADC.
ADR280
EN1
1
0
1
EN0
1
1
0
V+
Reference Mode
Use internal reference and internal
reference buffer (both are enabled).
Use external 1.2 V reference with
internal reference buffer enabled.
The internal reference is disabled.
Use external 4.096 V reference with
an external reference buffer. The
internal reference and reference
buffer are disabled.
1
AD7625