Datasheet

LTC1196/LTC1198
11
119698fb
TYPICAL PERFORMANCE CHARACTERISTICS
Spurious-Free Dynamic Range
vs Frequency
Output Amplitude
vs Input Frequency
INPUT FREQUENCY (Hz)
1k
PEAK-TO-PEAK OUTPUT (%)
10M
1196/98 G34
10k
100k
1M
100
80
60
40
20
0
V
REF
= V
CC
= 2.7V
V
REF
= V
CC
= 5V
FREQUENCY (Hz)
1k
70
60
50
40
30
20
10
0
1M
1196/98 G35
10k 100k 10M
SPURIOUS-FREE DYNAMIC RANGE (dB)
T
A
= 25°C
V
CC
= 3V
f
CLK
= 5MHz
V
CC
= 5V
f
CLK
= 12MHz
PIN FUNCTIONS
LTC1196
CS (Pin 1): Chip Select Input. A logic LOW on this input
enables the LTC1196. A logic HIGH on this input disables
the LTC1196.
IN
+
(Pin 2): Analog Input. This input must be free of noise
with respect to GND.
IN
–
(Pin 3): Analog Input. This input must be free of noise
with respect to GND.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
V
REF
(Pin 5): Reference Input. The reference input defi nes
the span of the A/D converter and must be kept free of
noise with respect to GND.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the se-
rial data transfer.
V
CC
(Pin 8): Power Supply Voltage. This pin provides power
to the A/D converter. It must be kept free of noise and ripple
by bypassing directly to the analog ground plane.
LTC1198
CS/SHUTDOWN (Pin 1): Chip Select Input. A logic LOW
on this input enables the LTC1198. A logic HIGH on this
input disables the LTC1198 and disconnects the power
to THE LTC1198.
CHO (Pin 2): Analog Input. This input must be free of
noise with respect to GND.
CH1 (Pin 3): Analog Input. This input must be free of noise
with respect to GND.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
D
IN
(Pin 5): Digital Data Input. The multiplexer address is
shifted into this input.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the se-
rial data transfer.
V
CC
(V
REF
) (Pin 8): Power Supply and Reference Volt-
age. This pin provides power and defi nes the span of the
A/D converter. It must be kept free of noise and ripple by
bypassing directly to the analog ground plane.