Rainbow Electronics ADC10D020 - Manual

ADC10D020
Dual 10-Bit, 20 MSPS, 150 mW A/D Converter
General Description
The ADC10D020 is a dual low power, high performance
CMOS analog-to-digital converter that digitizes signals to 10
bits resolution at sampling rates up to 30 MSPS while con-
suming a typical 150 mW from a single 3.0V supply. No
missing codes is guaranteed over the full operating tempera-
ture range. The unique two stage architecture achieves 9.5
Effective Bits over the entire Nyquist band at 20 MHz sample
rate. An output formatting choice of straight binary or 2’s
complement coding and a choice of two gain settings eases
the interface to many systems. Also allowing great flexibility
of use is a selectable 10-bit multiplexed or 20-bit parallel
output mode. An offset correction feature minimizes the off-
set error.
To ease interfacing to most low voltage systems, the digital
output power pins of the ADC10D020 can be tied to a
separate supply voltage of 1.5V to 3.6V, making the outputs
compatible with other low voltage systems. When not con-
verting, power consumption can be reduced by pulling the
PD (Power Down) pin high, placing the converter into a low
power state where it typically consumes less than 1 mW and
from which recovery is less than 1 ms. Bringing the STBY
(Standby) pin high places the converter into a standby mode
where power consumption is about 27 mW and from which
recovery is 800 ns.
The ADC10D020’s speed, resolution and single supply op-
eration makes it well suited for a variety of applications,
including high speed portable applications.
Operating over the industrial (−40˚ ≤ T
A
≤
+85˚C) tempera-
ture range, the ADC10D020 is available in a 48-pin TQFP. An
evaluation board is available to ease the design effort.
Features
n Internal sample-and-hold
n Internal reference capability
n Dual gain settings
n Offset correction
n Selectable straight binary or 2’s complement output
n Multiplexed or parallel output bus
n Single +2.7V to 3.6V operation
n Power down and standby modes
Key Specifications
n Resolution 10 Bits
n Conversion Rate 20 MSPS
n ENOB 9.5 Bits (typ)
n DNL 0.35 LSB (typ)
n Conversion Latency Parallel Outputs 2.5 Clock Cycles
— Multiplexed Outputs, I Data Bus 2.5 Clock Cycles
— Multiplexed Outputs, Q Data Bus 3 Clock Cycles
n PSRR 90 dB
n Power Consumption — Normal Operation 150 mW (typ)
— Power Down Mode < 1 mW (typ)
— Fast Recovery Standby Mode 27 mW (typ)
Applications
n Digital Video
n CCD Imaging
n Portable Instrumentation
n Communications
n Medical Imaging
n Ultrasound
April 2002
ADC10D020
Dual
10-Bit,
20
MSPS,
150
mW
A/D
Converter
© 2002 National Semiconductor Corporation DS200255 www.national.com