AD9231BCPZ-20 Analog Devices Inc, AD9231BCPZ-20 Datasheet - Page 19

• Manufacturer Part Number: AD9231BCPZ-20
• Description: 12 Bit, 20 MSPS Dual Low Power ADC
• Manufacturer: Analog Devices Inc

Specifications of AD9231BCPZ-20

• Number Of Bits: 12
• Sampling Rate (per Second): 20M
• Data Interface: Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 73.3mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

THEORY OF OPERATION
The AD9231 dual ADC design can be used for diversity recep-
tion of signals, where the ADCs are operating identically on the
same carrier but from two separate antennae. The ADCs can
also be operated with independent analog inputs. The user can
sample any f
appropriate low-pass or band-pass filtering at the ADC inputs
with little loss in ADC performance. Operation to 300 MHz
analog input is permitted but occurs at the expense of increased
ADC noise and distortion.
In nondiversity applications, the AD9231 can be used as a base-
band or direct downconversion receiver, where one ADC is
used for I input data and the other is used for Q input data.
Synchronization capability is provided to allow synchronized
timing between multiple channels or multiple devices.
Programming and control of the AD9231 is accomplished using
a 3-bit SPI-compatible serial interface.
ADC ARCHITECTURE
The AD9231 architecture consists of a multistage, pipelined ADC.
Each stage provides sufficient overlap to correct for flash errors
in the preceding stage. The quantized outputs from each stage are
combined into a final 12-bit result in the digital correction logic.
The pipelined architecture permits the first stage to operate with
a new input sample while the remaining stages operate with
preceding samples. Sampling occurs on the rising edge of
the clock.
Each stage of the pipeline, excluding the last, consists of a low
resolution flash ADC connected to a switched-capacitor DAC
and an interstage residue amplifier (for example, a multiplying
digital-to-analog converter (MDAC)). The residue amplifier
magnifies the difference between the reconstructed DAC output
and the flash input for the next stage in the pipeline. One bit of
redundancy is used in each stage to facilitate digital correction
of flash errors. The last stage simply consists of a flash ADC.
The output staging block aligns the data, corrects errors, and
passes the data to the CMOS output buffers. The output buffers
are powered from a separate (DRVDD) supply, allowing adjust-
ment of the output voltage swing. During power-down, the
output buffers go into a high impedance state.
S
/2 frequency segment from dc to 200 MHz, using
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ANALOG INPUT CONSIDERATIONS
The analog input to the AD9231 is a differential switched-
capacitor circuit designed for processing differential input
signals. This circuit can support a wide common-mode range
while maintaining excellent performance. By using an input
common-mode voltage of midsupply, users can minimize
signal-dependent errors and achieve optimum performance.
The clock signal alternately switches the input circuit between
sample-and-hold mode (see Figure 38). When the input circuit
is switched to sample mode, the signal source must be capable
of charging the sample capacitors and settling within one-half
of a clock cycle. A small resistor in series with each input can
help reduce the peak transient current injected from the output
stage of the driving source. In addition, low Q inductors or ferrite
beads can be placed on each leg of the input to reduce high
differential capacitance at the analog inputs and, therefore,
achieve the maximum bandwidth of the ADC. Such use of low
Q inductors or ferrite beads is required when driving the converter
front end at high IF frequencies. Either a shunt capacitor or two
single-ended capacitors can be placed on the inputs to provide a
matching passive network. This ultimately creates a low-pass
filter at the input to limit unwanted broadband noise. See the
AN-742 Application Note, the AN-827 Application Note, and the
Analog Dialogue article
Wideband A/D
information. In general, the precise values depend on the
application.
VIN+x
VIN–x
Figure 38. Switched-Capacitor Input Circuit
Converters” (Volume 39, April 2005) for more
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AD9231