Input Signal

Although the ADC accepts differential analog input sig-

nals, the EV kit only requires a single-ended analog

vided by the user. On-board transformers (T1–T8) con-

vert the single-ended analog input signal and generate

differential analog signals at the ADCs’ differential input

pins. Connect the single-ended analog input signals to

SMA connectors IN0–IN7 for channel 0 to channel 7,

respectively.

Reference Voltage

The EV kit can be configured to use the ADC’s 1.24V

internal reference, or a stable, low-noise, external refer-

ence. Use the 2 x 4 header JU12 to configure the

desired reference mode. See Table 6 for the appropri-

ate shunt settings.

Output Signal

The ADC features eight serial LVDS-compatible digital

outputs. Each output transmits the converted analog

input signals of channels 0 through 7. Two additional

outputs (CLKOUT and FRAME) are provided for data

synchronization. Refer to the MAX1434, MAX1436,

MAX1437, or MAX1438 data sheet for more details.

Output Format

The digital output coding can be chosen to be two’s

complement or straight offset binary by configuring

jumper JU7. See Table 7 for the appropriate jumper

configuration.

MAX1434/MAX1436/MAX1437/MAX1438

Evaluation Kits

6

_______________________________________________________________________________________

JUMPER

CLOCK INPUT RANGE

(MHz)

JU13

(PLL1)

JU6

(PLL2)

JU5

(PLL3)

MIN

MAX

2-3*

2-3*

2-3*

45.0

65.0

2-3

2-3

1-2

32.5

45.0

2-3

1-2

2-3

22.5

32.5

2-3

1-2

1-2

16.3

22.5

1-2

2-3

2-3

11.3

16.3

1-2

2-3

1-2

8.1

11.3

1-2

1-2

2-3

5.6

8.1

1-2

1-2

1-2

4.0

5.6

Table 5. MAX1438 PLL Jumper Settings

(JU5, JU6, JU13)

*

Default configuration: JU5, JU6, JU13 (2-3).

JUMPER

CLOCK INPUT RANGE

(MHz)

JU13

(PLL1)

JU6

(PLL2)

JU5

(PLL3)

MIN

MAX

2-3*

2-3*

2-3*

45.0

50.0

2-3

2-3

1-2

32.5

45.0

2-3

1-2

2-3

22.5

32.5

2-3

1-2

1-2

16.3

22.5

1-2

2-3

2-3

11.3

16.3

1-2

2-3

1-2

8.1

11.3

1-2

1-2

2-3

5.6

8.1

1-2

1-2

1-2

4.0

5.6

Table 4. MAX1437 PLL Jumper Settings

(JU5, JU6, JU13)

*

Default configuration: JU5, JU6, JU13 (2-3).

SHUNT

POSITION

REFADJ PIN

CONNECTION

EV KIT FUNCTION

1-2

Connected to

AVDD

Internal reference disabled.

Apply an external reference

voltage at the REFIO pad.

Verify that a shunt is installed

on jumper JU14.

3-4*

Connected to

GND

Internal reference enabled.

Verify that a shunt is not

installed on jumper JU14.

5-6**

Connected to

REFIO through

R57 and R51

Increase full-scale range by

adjusting potentiometer R51.

7-8**

Connected to

GND through

R57 and R51

Compensate for gain errors by

adjusting potentiometer R51.

Table 6. Reference Jumper Settings (JU12)

*

Default configuration: JU12 (3-4).

**

Refer to the Full-Scale Range Adjustments using the Internal

Reference section in the MAX1434, MAX1436, MAX1437, or

MAX1438 IC data sheet.

SHUNT

POSITION

T/B PIN

CONNECTION

DESCRIPTION

1-2

AVDD

Straight Offset Binary Selected.

Digital output in straight offset

binary format.

2-3*

GND

Two’s Complement Selected.

Digital output in two’s-

complement format.

Table 7. Output Format Jumper Settings (JU7)

*

Default configuration: JU7 (2-3).