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LTC1276 Datasheet(PDF) 8 Page - Linear Technology

Part No. LTC1276
Description  12-Bit, 300ksps Sampling A/D Converters with Reference
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC1276 Datasheet(HTML) 8 Page - Linear Technology

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8
LTC1273
LTC1275/LTC1276
127356fa
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
PI FU CTIO S
AIN (Pin 1): Analog Input. 0V to 5V (LTC1273), ±2.5V
(LTC1275) or
±5V (LTC1276).
VREF (Pin 2): +2.42V Reference Output. Bypass to
AGND (10
µF tantalum in parallel with 0.1µF ceramic).
AGND (Pin 3): Analog Ground.
D11-D4 (Pins 4 to 11): Three-State Data Outputs.
DGND (Pin 12): Digital Ground.
D3/11-D0/8 (Pins 13 to 16): Three-State Data Outputs.
NC (Pins 17 and 18): No Connection.
HBEN (Pin 19): High Byte Enable Input. This pin is used
to multiplex the internal 12-bit conversion result into
the lower bit outputs (D7-D0/8). See Table 1. HBEN also
disables conversion start when HIGH.
RD (Pin 20): READ Input. This active low signal starts
a conversion when CS and HBEN are low. RD also
enables the output drivers when CS is low.
CS (Pin 21): The CHIP SELECT Input must be low for
the ADC to recognize RD and HBEN inputs.
BUSY (Pin 22): The BUSY Output shows the converter
status. It is low when a conversion is in progress.
S/(N + D) vs Input Frequency and
Amplitude
Acquisition Time
vs Source Impedance
Intermodulation Distortion Plot
RSOURCE (Ω)
10
2500
3000
3500
4000
4500
100
1k
10k
LTC1273/75/76 • TPC10
2000
1500
500
0
1000
INPUT FREQUENCY (Hz)
20
40
50
70
80
10k
100k
10M
LTC1273/75/76 • TPC11
0
1k
60
30
10
1M
VIN = –60dB
VIN = –20dB
VIN = 0dB
fSAMPLE = 300kHz
Spurious Free Dynamic Range
vs Input Frequency
Reference Voltage
vs Load Current
LOAD CURRENT (mA)
–5
2.405
2.410
2.415
2.420
2.425
2.430
2.435
– 4
–2
–1
2
LTC1273/75/76 • TPC13
–3
0
1
INPUT FREQUENCY (Hz)
10k
–60
–50
–40
–30
–20
100k
1M
10M
LTC1273/75/76 • TPC12
–70
–80
–90
–100
–10
0
fSAMPLE = 300kHz
FREQUENCY (kHz)
0
–120
–100
–80
–60
–40
40
80
120
160
LTC1273/75/76 • F05
–20
0
20
60
100
140
fSAMPLE = 300kHz
fIN1 = 29.37kHz
fIN2 = 32.446kHz


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