WM2148 Datasheet, PDF (1/14 Pages) Wolfson Microelectronics plc – 14-bit 8MSPS Analogue-To-Digital Converter

WM2148
14-bit 8MSPS Analogue-To-Digital Converter
Production Data, February 2001, Rev 1.1
DESCRIPTION
The WM2148 is a 14-bit, 8 MSPS analogue to digital
converter with an on-chip voltage reference, high bandwidth
sample and hold amplifier and programmable gain. The
analogue input is differential, giving excellent common-
mode noise immunity and low distortion.
The WM2148 is designed for use in highly integrated, low-
power 3.3V systems. A high speed, microprocessor
compatible parallel interface allows control of the ADC input
gain, digital DC offset, internal / external reference and
output data format. Both binary and two’s complement
formats are supported. The device also features an out of
range indicator pin to show when the input signal exceeds
the converter’s full-scale range.
In Power Down mode, all analogue circuitry is internally
disconnected from the power supply, reducing total supply
current to 20µA.
The WM2148 is available in a 1mm thin 48-pin TQFP
package in standard commercial and industrial temperature
ranges.
FEATURES
• 14-bit resolution ADC
• 8 MSPS conversion rate
• Differential input
• 3.3V single supply
• Very low current power down mode - 20µA typical
• Microprocessor compatible parallel interface
• Internal or external voltage reference
• High bandwidth sample and hold amplifier
- 140MHz full-power bandwidth
• Programmable Gain Amplifier (PGA)
• Programmable DC offset
• Binary or two’s complement output format
• Out of range indicator
• 48-pin TQFP package, body thickness 1mm
APPLICATIONS
• Communications
• xDSL Front ends
• Industrial control
• Instrumentation
BLOCK DIAGRAM
VBG
PRECISION
REFERENCE
IN+
+
PGA
IN-
-
ADC
OUTPUT
BUFFERS
REF+
REF-
D[13:0]
OVI
PARALLEL INTERFACE AND
CONTROL LOGIC
WM2148
A[1:0] CSB WEB OEB CLK
WOLFSON MICROELECTRONICS LTD
Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.wolfson.co.uk
Production Data datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2001 Wolfson Microelectronics Ltd.