ADC1175-50
8-Bit, 50 MSPS, 125 mW A/D Converter
General Description
The ADC1175-50 is a low power, 50 MSPS analog-to-digital
converter that digitizes signals to 8 bits while consuming just
125 mW (typ). The ADC1175-50 uses a unique architecture
that achieves 6.8 Effective Bits and 25 MHz input and
50 MHz clock frequency. Output formatting is straight binary
coding.
The excellent DC and AC characteristics of this device, to-
gether with its low power consumption and +5V single supply
operation, make it ideally suited for many video and imaging
applications, including use in portable equipment. Further-
more, the ADC1175-50 is resistant to latch-up and the out-
puts are short-circuit proof. The top and bottom of the
ADC1175-50’s reference ladder is available for connections,
enabling a wide range of input possibilities. The low input ca-
pacitance (7 pF, typical) makes this device easier to drive
than conventional flash converters and the power down
mode reduces power consumption to less than 5 mW.
The ADC1175-50 is offered in SOIC (EIAJ) and TSSOP. It is
designed to operate over the commercial temperature range
of −20˚C to +75˚C.
Features
n Internal Track-and-Hold function
n Single +5V operation
n Internal reference bias resistors
n Industry standard pinout
n Power-down mode (<5 mW)
Key Specifications
n Resolution 8 Bits
n Maximum Sampling Frequency 50 MSPS (min)
n THD 54 dB (typ)
n DNL 0.7 LSB (typ)
n ENOB @ f
IN
= 25 MHz 6.8 Bits (typ)
n Guaranteed No Missing Codes
n Differential Phase 0.5˚ (typ)
n Differential Gain 1.0% (typ)
n Power Consumption 125 mW (typ), 190 mW (max)
(Excluding Reference Current)
Applications
n Digital Still Cameras
n CCD Imaging
n Electro-Optics
n Medical Imaging
n Communications
n Video Digitization
n Digital Television
n Multimedia
Connection Diagram
Ordering Information
ADC1175-50CIJM SOIC (EIAJ)
ADC1175-50CIJMX SOIC (EIAJ) (tape and reel)
ADC1175-50CIMT TSSOP
ADC1175-50CIMTX TSSOP (tape and reel)
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
DS100896-1
January 2000
ADC1
175-50
8-Bit,
50
MSPS,
125
mW
A/D
Converter
© 2000 National Semiconductor Corporation DS100896 www.national.com