WM2331 Datasheet, PDF (1/25 Pages) Wolfson Microelectronics plc – 10-bit 30MSPS ADC with PGA and Clamp

WM2331
10-bit 30MSPS ADC with PGA and Clamp
Production Data, April 2001, Rev 1.4
DESCRIPTION
The WM2331 is a high speed, 10-bit pipeline analogue-to-
digital converter (ADC) with on-chip programmable gain
amplifier (PGA) and clamp circuit, and internal voltage
references. Conversion is controlled by a single clock input.
The device has a high bandwidth differential sample and
hold input, which gives excellent common-mode noise
immunity and low distortion. Alternatively, it can be driven
in single ended fashion with an optional voltage clamp for
DC restoration that can take its reference from an on-chip
10-bit DAC or an external source.
The WM2331 provides internal reference voltages for
setting the ADC full-scale range without the requirement for
external circuitry. However, it can also accept external
references for applications where common or high-precision
references are required.
A bidirectional 10-bit parallel interface is used both to
control the device and to read ADC conversion data. ADC
data can be output in unsigned binary or two’s complement
format. An out-of-range output pin indicates when the input
signal is outside the converter’s range.
The WM2331 operates with independent analogue and
digital supplies of 3V to 5.5V and is supplied in a 28-pin
TSSOP package.
FEATURES
• 10-bit resolution ADC
• 30MSPS conversion rate
• Programmable Gain Amplifier (PGA)
• Built in clamp function (DC restore) with 10-bit DAC
• Adjustable internal voltage references
• Wide Input Bandwidth - 150MHz
• Unsigned Binary or Two’s complement output format
• Programmable via parallel interface
• Independent analogue and digital supplies, 3V to 5.5V
• Low power - 92mW typical at 3.0V supplies
• Powerdown mode to 3mW typical
• 28-pin TSSOP package
APPLICATIONS
• Composite Video Digitisation
• Digital Copiers
• Digital Video Cameras
• Set Top Box (STB)
• IF and Baseband Digitisation
• Medical Imaging
• High Speed Data Acquisition
BLOCK DIAGRAM
CLAMP
CLAMPIN
CLAMP
AMPLIFIER
M
U
X
CLAMP
LEVEL
DAC
CONTROL
REGISTERS
WR
AIN
REFTS
REFBS
REFSENSE
VREF
MODE
S/H
PGA
ADC
Core
INPUT/
OUTPUT
BUFFERS
ON-CHIP
REFERENCE
GENERATOR
TIMING
CONTROL
AVDD AGND
REFBF REFTF
WM2331
DIO[9:0]
OVR
OEB
CLK
DVDD
DGND
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.wolfsonmicro.com
Production Data datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
 2001 Wolfson Microelectronics Ltd.