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LTC1406_15 Datasheet, PDF (6/16 Pages) Linear Technology – Low Power, 8-Bit, 20Msps, Sampling A/D Converter
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LTC1406
PIN FUNCTIONS
AVDD (Pin 9): Analog 5V Positive Supply. Bypass to ana-
log ground plane with 10µF tantalum in parallel with 0.1µF
or 10µF ceramic.
AGND (Pin 10): Analog Ground. Tie to analog ground plane.
DGND (Pin 11): Digital Ground for Internal Logic. Tie to
analog ground plane.
DVDD (Pin 12): Digital 5V Positive Supply. Bypass to DGND
with 10µF tantalum in parallel with 0.1µF or 10µF ceramic.
NC (Pins 13, 14): No Internal Connection.
D7 to D0 (Pins 15 to 22): Digital Data Outputs. The out-
puts swing between OVDD and OGND.
OF/UF (Pin 23): Overflow/Underflow Bit. OF/UF high with
D7 to D0 all high indicates an overrange, OF/UF high with
D7 to D0 all low indicates an underrange condition. OF/UF
low indicates a conversion within the normal input range.
The outputs swing between OVDD and OGND.
CLK (Pin 24): Clock Input. Internal sample-and-hold tracks
the input signal when CLK is high and samples the input
signal on the falling edge.
AVDD = DVDD = VDD
PIN
NAME
1
OGND
2
OVDD
3
SHDN
4
VBIAS
5
VREF
6
AGND
7
AIN+
8
AIN–
9
AVDD
10
AGND
11
DGND
12
13 to 14
DVDD
NC
15 to 22 D7 to D0
23
OF/UF
24
CLK
DESCRIPTION
Ground for Output Drivers
Supply for Output Drivers
Shutdown Input, Active Low
Internal Bias Voltage
External Reference Input
Analog Ground, Clean Ground
Positive Analog Input, ±1V Span
Negative Analog Input
Analog Supply
Analog Ground, Substrate Ground
Digital Ground
Digital Supply
No Connect, No Internal Connection
Data Outputs
Overflow/Underflow Output
Clock Input
WU
W
TI I G DIAGRA
NOMINAL (V)
MIN
TYP
MAX
0
2.7
3 or 5
5.25
0
VDD
1.9
2.2
2.5
2
2.5
3
0
0
VDD
0
VDD
4.75
5
5.25
0
0
4.75
5
5.25
OGND
OGND
0
OVDD
OVDD
VDD
ABSOLUTE MAXIMUM (V)
MIN
MAX
– 0.3
VDD + 0.3
– 0.3
6
– 0.3
10
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
6
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
6
– 0.3
VDD + 0.3
– 0.3
VDD + 0.3
– 0.3
10
ANALOG
SIGNAL
N–1
t6
N
N+1
N+2
CLOCK
DATA OUT
N–6
t3
N–5
t2
N–4
N+3
t1
N–3
t5
N+4
N–2
N+5
t4
N–1
N+6
N
1406 TD
6
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