AD9224 Analog Devices, AD9224 Datasheet - Page 11

• Manufacturer Part Number: AD9224
• Description: 12-Bit 40 MSPS Monolithic A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9224

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 40MSPS
• Interface: Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,2 V p-p,4 V p-p,Uni (Vref) x 2,Uni 2.0V,Uni 4.0V
• Adc Architecture: Pipelined
• Pkg Type: SOP

Input
Connection
Single-Ended
Single-Ended
Differential
(via Transformer)
or Amplifier
NOTE
1
Reference
Operating Mode
INTERNAL
INTERNAL
INTERNAL
EXTERNAL
(NONDYNAMIC)
EXTERNAL
(DYNAMIC)
REV. A
VINA and VINB can be interchanged if signal inversion is required.
Coupling
DC
AC
AC/DC
Input Span (VINA–VINB)
(V p-p)
2
4
2 SPAN 4 AND
SPAN = 2 VREF
2 SPAN 4
2 SPAN 4
Input
Span (V)
2
2
4
2
2 or
2 VREF
4
2 VREF
2
2 VREF
4.0
VREF
VREF
VINA
0 to 2
0 to
2
0 to 4
2.0 – VREF
2.0 + VREF
0 to 1 or
0 to 2 VREF
0.5 to 4.5
2.0 – VREF
2.0 + VREF
2 to 3
2.0 – VREF/2
2.0 + VREF/2
1.5 to 3.5
to
to
to
Input Range (V)
VREF
Table I. Analog Input Configuration Summary
Table II. Reference Configuration Summary
1
VINB
1
VREF
2.0
2.0
1 or VREF
2.5
2.0
3 to 2
2.0 + VREF/2
2.0 – VREF/2
3.5 to 1.5
to
1
Required VREF (V)
1
2
1 VREF 2.0 AND
VREF = (1 + R1/R2)
1 VREF 2.0
CAPT and CAPB
Externally Driven
–11–
Figure
#
19, 20
19, 20
19, 20
30
21, 22
22
21
23, 24
23, 24
23, 24
Comments
Best for stepped input response applications, requires 5 V op amp.
Same as above but with improved noise performance due to
increase in dynamic range. Headroom/settling time require-
ments of 5 op amp should be evaluated.
Optimum noise performance, excellent SNR performance, often
requires low distortion op amp with VCC > +5 V due to its head-
room issues.
Optimum THD performance with VREF = 1. Single supply
operation (i.e., +5 V) for many op amps.
Optimum noise performance, excellent THD performance,
ability to use 5 V op amp.
Flexible input range, Optimum THD performance with
VREF = 1. Ability to use either +5 V or 5 V op amp.
Optimum full-scale THD and SFDR performance well beyond
the A/Ds Nyquist frequency. Preferred mode for undersampling
applications.
Same as above with the exception that full-scale THD and SFDR
performance can be traded off for better noise performance.
Optimum noise performance.
Connect
SENSE
SENSE
R1
R2
SENSE
VREF
SENSE
VREF
EXT. REF.
EXT. REF.
To
VREF
REFCOM
VREF AND SENSE
SENSE AND REFCOM
AVDD
EXT. REF.
AVDD
AVSS
CAPT
CAPB
AD9224