LTC1405 Datasheet, PDF (1/16 Pages) Linear Technology – 12-Bit, 5Msps, Sampling ADC

FEATURES
s _{5Msps Sample Rate}
s _{Low Power Dissipation: 115mW}
s _{Single 5V Supply or ±5V Supplies}
s _{Integral Nonlinearity Error <0.35LSB}
s _{Differential Nonlinearity <0.25LSB}
s _{71.3dB S/(N + D) and 85dB SFDR at Nyquist}
s _{100MHz Full-Power Bandwidth Sampling}
s _{±2.048V, ±1.024V and ±0.512V Bipolar Input Range}
s _{Input PGA}
s _{Out-of-Range Indicator}
s _{True Differential Inputs with 75dB CMRR}
s _{28-Pin Narrow SSOP Package}
s _{Pin-Compatible 10Msps Version (LTC1420)}
U
APPLICATIO S
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectral Analysis}
s _{Imaging Systems}
, LTC and LT are registered trademarks of Linear Technology Corporation.
Final Electrical Specifications
LTC1405
12-Bit, 5Msps,
Sampling ADC
January 2000
DESCRIPTIO
The LTC^®1405 is a 5Msps, 12-bit sampling A/D converter
that draws only 115mW from either single 5V or dual ±5V
supplies. This easy-to-use device includes a high dynamic
range sample-and-hold, a precision reference and a PGA
input circuit.
The LTC1405 has a flexible input circuit that allows full-
scale input ranges of ±2.048V, ±1.024V and ±0.512V. The
input common mode range is rail-to-rail and a common
mode bias voltage is provided for single supply applica-
tions. The input PGA has a digitally selectable 1x or 2x
gain.
Maximum DC specs include ±1LSB INL and ±1LSB DNL
over temperature. Outstanding AC performance includes
71.3dB S/(N + D) and 85dB SFDR at the Nyquist input
frequency of 2.5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 100MHz
bandwidth. The 75dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source. A
separate output logic supply allows direct connection to
3V components.
TYPICAL APPLICATIO
5V
5V
5V
1µF
GAIN
1µF
AV_DD
DV_DD
1µF
OV_DD
+A_IN
–A_IN
V_CM
1µF
SENSE
V_REF
1µF
S/H
MODE SELECT
PIPELINED 12-BIT ADC
DIGITAL CORRECTION
LOGIC
2.5V
REFERENCE
2.048V
OUTPUT
BUFFERS
OPTIONAL 3V
LOGIC SUPPLY
OF
D11 (MSB)
D0 (LSB)
5MHz CLK
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
Typical INL Curve
1024
2048
CODE
3072
4096
1405 TA02
V_SS
1µF
0V OR –5V
AGND
DGND
OGND
1405 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However,
no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the
interconnection of its circuits as described herein will not infringe on existing patent rights.
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