Datasheet
6
LTC1860L/LTC1861L
18601Lf
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
TEMPERATURE (°C)
–50 25 75
1860L/61L G13 1860L/61L G14
–25 0
50 100 125
CHANGE IN GAIN ERROR (LSB)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
THD (dB)
1
SNR (dB)
80
70
60
50
40
30
20
10
0
10 100
1860L/61L G15
f
IN
(kHz)
1
SINAD (dB)
80
70
60
50
40
30
20
10
0
10 100
1860L/61L G16
f
IN
(kHz)
1 10 100
1860L/61L G17
SFDR (dB)
100
90
80
70
60
50
40
30
20
10
0
f
IN
(kHz)
1 10 100
1860L/61L G18
0 5 15 25 35 45 55 65 7510 20 30 40 50 60 70
AMPLITUDE (dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
IN
(kHz) f
IN
(kHz)
f
S
= 150kHz
V
CC
= 2.7V
V
REF
= 2.5V
f
S
= 150kHz
T
A
= 25°C
V
CC
= 3V
V
IN
= 0dB
V
REF
= 3V
f
IN
= 1kHz
f
S
= 150kHz
T
A
= 25°C
V
CC
= 3V
V
REF
= 3V
f
S
= 150kHz
T
A
= 25°C
V
CC
= 3V
V
IN
= 0dB
V
REF
= 3V
f
S
= 150kHz
T
A
= 25°C
V
CC
= 3V
V
IN
= 0dB
V
REF
= 3V
f
S
= 150kHz
T
A
= 25°C
V
CC
= 3V
V
IN
= 0dB
V
REF
= 3V
V
REF
(Pin 1): Reference Input. The reference input defines
the span of the A/D converter and must be kept free of
noise with respect to GND.
IN
+
, IN
–
(Pins 2, 3): Analog Inputs. These inputs must be
free of noise with respect to GND.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
CONV (Pin 5): Convert Input. A logic high on this input
starts the A/D conversion process. If the CONV input is left
UU
U
PI FU CTIO S
LTC1860L
high after the A/D conversion is finished, the part powers
down. A logic low on this input enables the SDO pin,
allowing the data to be shifted out.
SDO (Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this pin.
SCK (Pin 7): Shift Clock Input. This clock synchronizes the
serial data transfer.
V
CC
(Pin 8):
Positive Supply. This supply must be kept
free of noise and ripple by bypassing directly to the
analog ground plane.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Change in Gain Error vs
Temperature
SNR vs f
IN
4096 Point FFT Non Averaged
Signal-to-(Noise + Distortion)
vs f
IN
Total Harmonic Distortion
vs f
IN
Spurious Free Dynamic Range
vs f
IN