16-Bit, 135ksps, Single-Supply ADCs with

Bipolar Analog Input Range

6

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

SINAD vs. FREQUENCY

FREQUENCY (kHz)

10

10

20

30

40

50

60

70

80

90

100

0

1100

SFDR vs. FREQUENCY

FREQUENCY (kHz)

10

20

40

60

80

100

120

0

1100

THD vs. FREQUENCY

FREQUENCY (kHz)

10

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-110

1100

Pin Description

PIN

NAME

FUNCTION

1

D4/D12

Tri-State Digital-Data Output

2

D5/D13

Tri-State Digital-Data Output

3

D6/D14

Tri-State Digital-Data Output

4

D7/D15

Tri-State Digital-Data Output. D15 is the MSB.

5R/

C

Read/Convert Input. Power up and put the MAX1178/MAX1188 in acquisition mode by holding R/

C

low during the first falling edge of

CS. During the second falling edge of CS, the level on R/C

determines whether the reference and reference buffer power down or remain on after conversion.

Set R/

C high during the second falling edge of CS to power down the reference and buffer, or set R/C

low to leave the reference and buffer powered up. Set R/

C high during the third falling edge of CS to

put valid data on the bus.

6

EOC

End of Conversion.

EOC drives low when conversion is complete.

Analog Supply Input. Bypass with a 0.1µF capacitor to AGND.

8

AGND

Analog Ground. Primary analog ground (star ground).

9

AIN

Analog Input

10

AGND

Analog Ground. Connect pin 10 to pin 8.

11

REFADJ

Reference Buffer Output. Bypass REFADJ with a 0.1µF capacitor to AGND for internal reference

12

REF

Reference Input/Output. Bypass REF with a 10µF capacitor to AGND for internal reference mode.

External reference input when in external reference mode.