LTC1405_1 Datasheet, PDF (1/20 Pages) Linear Technology – 12-Bit, 5Msps, Sampling ADC

LTC1405
12-Bit, 5Msps,
Sampling ADC
FEATURES
■ _{5Msps Sample Rate}
■ _{Low Power Dissipation: 115mW}
■ _{Single 5V Supply or ±5V Supplies}
■ _{71.3dB S/(N + D) and 85dB SFDR at Nyquist}
■ _{100MHz Full-Power Bandwidth Sampling}
■ _{Input PGA}
■ _{Integral Nonlinearity Error <0.35LSB}
■ _{Differential Nonlinearity <0.25LSB}
■ _{±2.048V, ±1.024V and ±0.512V Bipolar Input Range}
■ _{Out-of-Range Indicator}
■ _{True Differential Inputs with 75dB CMRR}
■ _{Pin-Compatible 10Msps Version (LTC1420)}
■ _{28-Pin Narrow SSOP Package}
U
APPLICATIO S
■ _{Telecommunications}
■ _{Digital Signal Processing}
■ _{Multiplexed Data Acquisition Systems}
■ _{High Speed Data Acquisition}
■ _{Spectral Analysis}
■ _{Imaging Systems}
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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 applications. 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 fre-
quency 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 sepa-
rate output logic supply allows direct connection to 3V
components.
TYPICAL APPLICATION
5V
5V
5V
1µF
GAIN
1µF
V_DD
(PIN 7)
V_DD
(PIN 23)
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
V_SS
1µF
0V OR –5V
GND
(PIN 6)
GND
(PIN 8)
GND
(PIN 24)
OGND
1405 TA01
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
1405fa
1