LTC1410
12-Bit, 1.25Msps Sampling
A/D Converter with Shutdown
FEATURES
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DESCRIPTIO
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1.25Msps Sample Rate
Power Dissipation: 160mW
71dB S/(N + D) and 82dB THD at Nyquist
No Pipeline Delay
Nap (7mW) and Sleep (10µW) Shutdown Modes
Operates with Internal 15ppm/°C Reference
or External Reference
True Differential Inputs Reject Common Mode Noise
20MHz Full Power Bandwidth Sampling
±2.5V
Bipolar Input Range
28-Pin SO Wide Package
The LTC
®
1410 is a 0.65µs, 1.25Msps, 12-bit sampling
A/D converter that draws only 160mW from
±5V
supplies.
This easy-to-use device includes a high dynamic range
sample-and-hold, a precision reference and requires no
external components. Two digitally selectable power shut-
down modes provide flexibility for low power systems.
The LTC1410’s full-scale input range is
±2.5V.
Maximum
DC specifications include
±1LSB
INL and
±1LSB
DNL over
temperature. Outstanding AC performance includes 71dB
S/(N + D) and 82dB THD at the Nyquist input frequency of
625kHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 20MHz
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
µP
compatible, 12-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and a data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATI
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Telecommunications
Digital Signal Processing
Multiplexed Data Acquisition Systems
High Speed Data Acquisition
Spectrum Analysis
Imaging Systems
TYPICAL APPLICATI
Complete 1.25MHz, 12-Bit Sampling A/D Converter
LTC1410
DIFFERENTIAL 1
AV
DD
+A
IN
ANALOG INPUT
(–2.5V TO 2.5V) 2
–A
IN
DV
DD
2.50V 3 V
V
SS
V
REF
OUTPUT 4
REF
REFCOMP
BUSY
5
0.1µF
AGND
CS
6
D11(MSB) CONVST
7
D10
RD
8
D9
SHDN
9
D8
NAP/SLP
10
D7
OGND
11
12-BIT
D6
D0
PARALLEL
12
D5
D1
BUS
13
D4
D2
14
DGND
D3
5V
28
27
26
25
24
23
22
21
20
19
18
17
16
15
µP
CONTROL
LINES
10µF
–5V
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
12
74
68
10
8
6
4
2
0
1k
f
SAMPLE
= 1.25MHz
10k
100k
1M
INPUT FREQUENCY (Hz)
10M
LTC1410 • TA02
+
10µF
0.1µF
EFFECTIVE BITS
0.1µF
+
10µF
1410 TA01
U
NYQUIST
62
56
50
S/(N + D) (dB)
UO
UO
1
LINER [ LINEAR TECHNOLOGY ]
