AD12400 datasheet(16/24 Pages) AD

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AD12400

Rev. A | Page 16 of 24

Any disturbances to the AD12400 structure, including

removing the covers or mounting screws, invalidates the

calibration and results in degraded performance. Refer to the

Outline Dimensions section for mounting stud dimensions.

Refer also to Figure 37 for PCB interface locations. Mounting

stud length typically accommodates a PCB thickness of 0.093".

Consult the factory if board thickness requirements exceed this

dimension.

AD12400 EVALUATION KIT

The AD12400/KIT offers an easy way to evaluate the AD12400.

The AD12400/KIT includes the AD12400KWS mounted on an

adapter card, the AD12400 evaluation board, the power supply

cables, a 225 MHz buffer memory FIFO board, and the Dual

Analyzer software. The user must supply a clock source, an

analog input source, a 1.5 V power supply, a 3.3 V power supply,

a 5 V power supply, and a 3.8 V power supply. The clock source

and analog input source connect directly to the AD12400KWS.

The power supply cables (included) and a parallel port cable

(not included) connect to the evaluation board.

Power Connector

Power is supplied to the board via a detachable 12-lead power

strip (three 4-pin blocks).

Table 8. Power Connector

VA 3.8 V

Analog Supply for the ADC (950 mA typ)

VC 3.3 V

Digital supply for the ADC outputs (200 mA typ)

VD 1.5 V1

Digital supply for the FPGA (2.5 A max, 1.4 A typ)

VB 5.0 V

Digital supply for the buffer memory board

(400 mA typ)

1 The power supply cable has an approximately 100 mV drop. The VD supply

current is dependent on the analog input frequency. Refer to Figure 17.

Analog Input

The analog input source connects directly to an SMA on the

AD12400KWS.

Encode

The single-ended or differential encode signal connects directly

to SMA connector(s) on the AD12400KWS. A single-ended

sine wave at 10 dBm connected to the encode SMA is recom-

mended. A low jitter clock source is recommended (<0.5 ps) to

properly evaluate the AD12400.

Data Outputs

The AD12400KWS digital outputs are available at the 80-pin

connector, P2, on the evaluation board. The AD12400/KIT

comes with a buffer memory FIFO board connected to P2

that provides the interface to the parallel port of a PC. The

Dual Analyzer software is compatible with Windows® 95,

Windows 98, Windows 2000, and Windows NT®.

The buffer memory FIFO board can be removed, and an

external logic analyzer, or other data acquisition module, can be

connected to this connector, if required.

Adapter Card

The AD12400KWS is attached to an adapter card that interfaces

to the evaluation board through a 120-pin connector, P1, which

is on the top side of the evaluation board.

Digital Postprocessing Control

The AD12400 has a two-pin jumper labeled AFB that allows

the user to enable/disable the digital postprocessing. The digital

postprocessing is active when the AFB jumper is applied. When

the jumper is removed, the FPGA is set to a passthrough mode,

which demonstrates to the user the performance of the AD12400

without the digital postprocessing.

RESET

The AD12400KWS’s FPGA configuration is stored in an

EEPROM and loaded into the FPGA when power is applied to

the AD12400. The RESET switch, SW1 (active low), allows the

user to reload the FPGA in case of a low voltage condition or a

power supply glitch. Depressing the RESET switch pulls the

data ready and output bits high. The RESET switch should

remain low for a minimum of 200 ns. On the rising edge of the

RESET pulse, the AD12400 starts loading the configuration into

the on-module FPGA. The reload process requires a maximum

of 600 ms to complete. Valid signals on the data-ready pins

indicate the reset process is complete.

The AD12400 is not compatible with the HSC-ADC-EVAL-

DC/SC hardware or software.

Table 9. Evaluation Board Bill of Materials (BOM)

Item No.

Quantity

REF-DES

Device

Package

Value

C3, C5

Capacitors

603

0.1 μF, 25 V

C4, C6

Capacitors

805

10 μF, 6.3 V

Resistor

603

4.02 kΩ, 1%

AFB

2-Pin Header/Jumper

Pin Strip

Molex/GC/Weldon

80-Pin Dual Connector Assemble

Surface Mount

Post Header AMP

SW1

Switch Push Button SPST

6 MM

Panasonic

J2, J3, J4

4-Pin Header Power Connecters

Pin Strip

Wieland

60-Pin Dual-Socket Assembly

Surface Mount

SAMTEC

PCB

AD12400 Interface Bd GS08054

PCB

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