MAX1195 datasheet(19/22 Pages) MAXIM | Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs

Part #	MAX1195

Description	Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Parallel Outputs

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Manufacturer	MAXIM [Maxim Integrated Products]

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Grounding, Bypassing,

and Board Layout

The MAX1195 requires high-speed board layout design

techniques. Locate all bypass capacitors as close to

the device as possible, preferably on the same side as

the ADC, using surface-mount devices for minimum

inductance. Bypass VDD, REFP, REFN, and COM with

two parallel 0.1µF ceramic capacitors and a 2.2µF

bipolar capacitor to GND. Follow the same rules to

bypass the digital supply (OVDD) to OGND. Multilayer

boards with separated ground and power planes pro-

duce the highest level of signal integrity. Consider the

use of a split ground plane arranged to match the

physical location of the analog ground (GND) and the

digital output driver ground (OGND) on the ADC’s

package. The two ground planes should be joined at a

single point so the noisy digital ground currents do not

interfere with the analog ground plane. The ideal loca-

tion for this connection can be determined experimen-

tally at a point along the gap between the two ground

planes, which produces optimum results. Make this

connection with a low-value, surface-mount resistor (1

Ω

to 5

Ω), a ferrite bead, or a direct short.

Alternatively, all ground pins could share the same

ground plane, if the ground plane is sufficiently isolated

from any noisy, digital systems ground plane (e.g.,

downstream output buffer or DSP ground plane). Route

high-speed digital signal traces away from the sensitive

analog traces of either channel. Make sure to isolate

the analog input lines to each respective converter to

minimize channel-to-channel crosstalk. Keep all signal

lines short and free of 90

° turns.

Static Parameter Definitions

Integral Nonlinearity

Integral nonlinearity (INL) is the deviation of the values

on an actual transfer function from a straight line. This

straight line can be either a best-straight-line fit or a line

drawn between the endpoints of the transfer function,

once offset and gain errors have been nullified. The

static linearity parameters for the MAX1195 are mea-

sured using the best-straight-line-fit method.

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between

an actual step width and the ideal value of 1LSB. A

DNL error specification of less than 1LSB guarantees

no missing codes and a monotonic transfer function.

Dual, 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Parallel Outputs

______________________________________________________________________________________

19

0

°

90

°

÷8

DOWNCONVERTER

MAX2451

INA+

MAX1195

INA-

INB+

INB-

DSP

POST-

PROCESSING

Figure 10. Typical QAM Application Using the MAX1195

HOLD

ANALOG

INPUT

SAMPLED

DATA (T/H)

T/H

tAD

tAJ

TRACK

CLK

Figure 11. T/H Aperture Timing

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