LTC1410 Datasheet, PDF (1/16 Pages) Linear Technology – 12-Bit, 1.25Msps Sampling A/D Converter with Shutdown

LTC1410
12-Bit, 1.25Msps Sampling
A/D Converter with Shutdown
FEATURES
s _{1.25Msps Sample Rate}
s _{Power Dissipation: 160mW}
s _{71dB S/(N + D) and 82dB THD at Nyquist}
s _{No Pipeline Delay}
s _{Nap (7mW) and Sleep (10µW) Shutdown Modes}
s _{Operates with Internal 15ppm/°C Reference}
or External Reference
s _{True Differential Inputs Reject Common Mode Noise}
s _{20MHz Full Power Bandwidth Sampling}
s _{±2.5V Bipolar Input Range}
s _{28-Pin SO Wide Package}
APPLICATI 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^®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.
TYPICAL APPLICATI
+
10µF
Complete 1.25MHz, 12-Bit Sampling A/D Converter
LTC1410
DIFFERENTIAL ₁
28
ANALOG INPUT
(–2.5V TO 2.5V)
2.50V
V_REF OUTPUT
2
3
4
+A_IN
–A_IN
V_REF
AV_{DD 27}
DV_{DD 26}
V_{SS 25}
REFCOMP BUSY
5
24
0.1µF
AGND
CS
6
23
D11(MSB) CONVST
7
22
D10
RD
8
21
D9
SHDN
9
20
D8
NAP/SLP
10
19
D7
OGND
12-BIT 11
18
PARALLEL
D6
12
D0
17
BUS
D5
D1
13
16
D4
D2
14
15
DGND
D3
– 5V
10µF
µP CONTROL
LINES
+
10µF
0.1µF
1410 TA01
5V
0.1µF
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
12
74
68
10
NYQUIST
62
56
8
50
6
4
2
f_SAMPLE = 1.25MHz
0
1k
10k
100k
1M
10M
INPUT FREQUENCY (Hz)
LTC1410 • TA02
1