LTC1414_15 Datasheet, PDF (1/20 Pages) Linear Technology – 14-Bit, 2.2Msps, Sampling A/D Converter

LTC1414
14-Bit, 2.2Msps,
Sampling A/D Converter
FEATURES
s _{Sample Rate: 2.2Msps}
s _{Outstanding Spectral Purity:}
80dB S/(N + D) and 95dB SFDR at 100kHz
78dB S/(N + D) and 84dB SFDR at Nyquist
s _{Ultralow Distortion with Single-Ended or}
Differential Inputs
s _{±2.5V Bipolar Input Range Eliminates Level Shifting}
and Rail-to-Rail Op Amp Requirements
s _{Easy Hookup for External or Internal Reference}
s _{No Pipeline Delay}
s _{Power Dissipation: 175mW on ±5V Supplies}
s _{28-Pin Narrow SSOP Package}
U
APPLICATIO S
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectrum Analysis}
s _{Imaging Systems}
DESCRIPTIO
The LTC ^®1414 is a 14-bit, 2.2Msps, sampling A/D con-
verter which draws only 175mW from ±5V supplies. This
high performance ADC includes a high dynamic range
sample-and-hold, a precision reference and requires no
external components.
The LTC1414’s high performance sample-and-hold has a
full-scale input range of ±2.5V. Outstanding AC perfor-
mance includes 80dB S/(N + D) and 95dB SFDR with a
100kHz input. The performance remains high at the Nyquist
input frequency of 1.1MHz with 78dB S/(N + D) and 84dB
SFDR.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 40MHz
bandwidth. The 70dB common mode rejection can elimi-
nate ground loops and common mode noise by measuring
signal differentially from the source
The ADC has a microprocessor compatible, 14-bit parallel
output port. There is no pipline delay in the conversion
results.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
A_IN+
A_IN–
COMP
10µF
V_REF
1µF
LTC1414
5V
10µF
AV_DD
DV_DD
OPTIONAL 3V
LOGIC SUPPLY
OV_DD
S/H
4.0625V
BUFFER
14-BIT ADC
14
OUTPUT
BUFFERS
D13 (MSB)
•
•
•
D0 (LSB)
10µF
2k
2.5V
REFERENCE
V_SS
– 5V
AGND
TIMING AND
LOGIC
DGND
OGND
BUSY
CONVST
1414 TA01
Effective Bits and Signal-to-Noise + Distortion
vs Input Frequency
14
86
13
80
12
74
11
68
10
9
8
7
6
5
4
3 _{fSAMPLE = 2.2MHz}
2
1k
10k
100k
1M
INPUT FREQUENCY (Hz)
10M
1414 TA02
1