ltc1407a-1 Linear Technology Corporation, ltc1407a-1 Datasheet - Page 8

• Manufacturer Part Number: ltc1407a-1
• Description: Serial 12-bit, 3msps Simultaneous Sampling Adcs With Shutdown
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
LTC1407-1/LTC1407A-1
CH0
differentially with respect to CH0
differential swing with respect to CH0
absolute input range.
CH0
differentially with respect to CH0
differential swing with respect to CH0
absolute input range.
V
a solid analog ground plane with a 10µF ceramic capacitor
(or 10µF tantalum in parallel with 0.1µF ceramic). Can be
overdriven by an external reference voltage ≥ 2.55V and
≤V
CH1
differentially with respect to CH1
differential swing with respect to CH1
absolute input range.
CH1
differentially with respect to CH1
differential swing with respect to CH1
absolute input range.
GND (Pins 6, 11): Ground and Exposed Pad. This single
ground pin and the Exposed Pad must be tied directly to
8
REF
U
DD
+
–
+
–
(Pin 3): 2.5V Internal Reference. Bypass to GND and
.
(Pin 1): Noninverting Channel 0. CH0
(Pin 4): Noninverting Channel 1. CH1
(Pin 2): Inverting Channel 0. CH0
(Pin 5): Inverting Channel 1. CH1
U
2.4902
2.4900
2.4898
2.4896
2.4894
2.4892
2.4890
2.6
Reference Voltage vs V
U
2.8
W
3.0
–
+
–
+
V
U
DD
, with a –1.25V to 1.25V
, with a 1.25V to –1.25V
, with a –1.25V to 1.25V
, with a 1.25V to –1.25V
3.2
(V)
–
+
–
+
DD
3.4
and a 0 to V
–
and a 0 to V
and a 0 to V
–
and a 0 to V
+
+
operates fully
operates fully
operates fully
operates fully
14071 G19
3.6
DD
DD
DD
DD
the solid ground plane under the part. Keep in mind that
analog signal currents and digital output signal currents
flow through these connections.
V
supplies 3V to the entire chip. Bypass to GND pin and solid
analog ground plane with a 10µF ceramic capacitor (or
10µF tantalum) in parallel with 0.1µF ceramic. Keep in
mind that internal analog currents and digital output signal
currents flow through this pin. Care should be taken to
place the 0.1µF bypass capacitor as close to Pins 6 and 7
as possible.
SDO (Pin 8): Three-state Serial Data Output. Each pair of
output data words represent the two analog input chan-
nels at the start of the previous conversion. The output
format is 2’s complement.
SCK (Pin 9): External Clock Input. Advances the conver-
sion process and sequences the output data on the rising
edge. One or more pulses wake from sleep.
CONV (Pin 10): Convert Start. Holds the two analog input
signals and starts the conversion on the rising edge. Two
pulses with SCK in fixed high or fixed low state starts Nap
mode. Four or more pulses with SCK in fixed high or fixed
low state starts Sleep mode.
DD
(Pin 7): 3V Positive Supply. This single power pin
2.4902
2.4900
2.4898
2.4896
2.4894
2.4892
2.4890
V
DD
0
Reference Voltage
vs Load Current
= 3V, T
0.2
0.4
0.6
LOAD CURRENT (mA)
A
= 25°C (LTC1407-1/LTC1407A-1)
0.8
1.0
1.2
1.4
1.6
1.8
14071 G20
2.0
14071fa