6

LTC1860/LTC1861

18601f

TYPICAL PERFOR A CE CHARACTERISTICS

Change in Gain Error vs

Temperature

TEMPERATURE (

°C)

–50

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

0

50

75

1860/61 G13

–25

25

100

125

the span of the A/D converter and must be kept free of

noise with respect to GND.

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

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.

free of noise and ripple by bypassing directly to the

analog ground plane.

INPUT LEVEL (dB)

–40

1195 G20

–30

–35

–25

–15

–20

–5

–10

0

80

70

60

50

40

30

20

10

0

f (kHz)

060 70

90

0

–20

–40

–60

–80

–100

–120

10 20 30

80

40

1860/61 G15

100

50

100

90

80

70

60

50

40

30

20

10

0

1

100

1000

10000

1860/61 G16

10

T

SNR

SINAD

1

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

10

100

1000

1860/61 G17

1

100

90

80

70

60

50

40

30

20

10

0

10

100

1000

1860/61 G18

4096 Point FFT

Signal-to-(Noise + Distortion)

vs Input Level

Signal-to-(Noise + Distortion)

Total Harmonic Distortion

Spurious Free Dynamic Range