LTC1406_15 Datasheet, PDF (1/16 Pages) Linear Technology – Low Power, 8-Bit, 20Msps, Sampling A/D Converter

FEATURES
s _{Low Power, 8-Bit, 20Msps ADC}
s _{250MHz Internal Sample-and-Hold}
s _{7 Effective Bits at 70MHz Input Frequency}
s _{±1LSB DNL and INL Max}
s _{Single 5V Supply and 150mW Dissipation}
s _{Power Down to 1µA}
s _{True Differential Inputs Reject Common Mode Noise}
s _{Accepts Single-Ended or Differential Input Signals}
s _{±1V Differential or 2V Single-Ended Input Span}
s _{Analog Inputs Common Mode to VDD and GND}
s _{24-Pin Narrow SSOP Package}
U
APPLICATIONS
s _{Telecommunications}
s _{Wireless Communications}
s _{Digital Cellular Telephones}
s _{CCDs and Image Scanners}
s _{Video Digitizing and Digital Television}
s _{Digital Color Copiers}
s _{High Speed Undersampling}
s _{Personal Computer Video}
s _{High Speed Data Acquisition}
LTC1406
Low Power, 8-Bit, 20Msps,
Sampling A/D Converter
DESCRIPTION
The LTC ^®1406 is a 20Msps, 8-bit, sampling A/D converter
which draws only 150mW from a single 5V supply. This
easy-to-use device includes a high dynamic range sample-
and-hold with a 250MHz bandwidth.
The LTC1406’s full-scale input range is ±1V. The inputs
can be driven differentially or one input can be tied to a
fixed voltage and the other input driven with a ±1V bipolar
input. Maximum DC specifications include ±1LSB DNL
and INL over temperature. Outstanding AC performance
includes 48.5dB S/(N + D) and 62dB THD with a 1MHz
input; 47.5dB S/(N + D) and 59dB THD at the Nyquist input
frequency of 10MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 250MHz
bandwidth. The 60dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has an 8-bit parallel output port with separate
power supply and ground allowing easy interface to 3V
digital systems. The pipelined architecture has five clock
cycles of data latency.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Low Power, 20MHz, 8-Bit Sampling ADC
DV_DD
12
DGND
11
OV_DD
2
24
CLK
CLOCK
CIRCUITRY
A_IN+ ⁷
A_IN– ⁸
TRACK-AND-
HOLD AMP
2.2V
2.5k 1.95k
8-BIT
PIPELINE
ADC
DIGITAL
DATA
OUTPUT
DRIVERS
9
AV_DD
4
V_BIAS
10
3
AGND SHDN
5
6
V_REF AGND
1
OGND
23
OF/UF
22
D7
21 _D6
20 _D5
19 _D4
18 _D3
17
D2
16
D1
15
D0
1406 BD
Effective Bits and Signal-to-Noise + Distortion
vs Input Frequency
8
7
6
5
4
3
2
1
0
100k
50
44
38
32
1M
10M
INPUT FREQUENCY (Hz)
100M
1406 TA02
1