LTC1412 Datasheet, PDF (1/16 Pages) Linear Technology – 12-Bit, 3Msps, Sampling A/D Converter

LTC1412
12-Bit, 3Msps,
Sampling A/D Converter
FEATURES
s _{Sample Rate: 3Msps}
s _{72dB S/(N + D) and 82dB SFDR at Nyquist}
s _{±0.35LSB INL and ±0.25LSB DNL (Typ)}
s _{Power Dissipation: 150mW}
s _{External or Internal Reference Operation}
s _{True Differential Inputs Reject Common Mode Noise}
s _{40MHz Full Power Bandwidth Sampling}
s _{±2.5V Bipolar Input Range}
s _{No Pipeline Delay}
s _{28-Pin SSOP Package}
U
APPLICATIONS
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Mulitplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectrum Analysis}
s _{Imaging Systems}
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTION
The LTC ^®1412 is a 12-bit, 3Msps, sampling A/D con-
verter. This high performance device includes a high
dynamic range sample-and-hold and a precision refer-
ence. Operating from ±5V supplies it draws only 150mW.
The ±2.5V input range is optimized for low noise and low
distortion. Most high performance op amps also perform
best over this range, allowing direct coupling to the analog
inputs and eliminating the need for special translation
circuitry. Outstanding AC performance includes 72dB
S/(N + D) and 82dB SFDR at the Nyquist input frequency
of 1.5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 40MHz
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 a high speed 12-bit parallel output port. There
is no pipeline delay in the conversion results. A separate
convert start input and converter status signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors. A
digital output driver power supply pin allows direct con-
nection to 3V logic.
TYPICAL APPLICATION
LTC1412
5V
10µF
AV_DD
DV_DD
OV_DD
OPTIONAL
3V LOGIC
SUPPLY
A_IN+
A_IN–
COMP
10µF
V_REF
12
S/H
12-BIT ADC
OUTPUT
BUFFERS
4.0625V
BUFFER
2k
2.5V
REFERENCE
TIMING AND
LOGIC
D11 (MSB)
•
•
•
D0 (LSB)
BUSY
CS
CONVST
10µF
V_SS
– 5V
AGND
DGND
OGND
1412 TA01
Effective Bits and Signal-to-Noise + Distortion
vs Input Frequency
12
74
68
10
62
56
8
6
4
2
0
1k
10k
100k
1M
10M
INPUT FREQUENCY (Hz)
1412 G01
1