General Description

The MAX2312/MAX2316 evaluation kits (EV kits) simpli-
fy testing of the MAX2312/MAX2316 IF receivers. These
kits allow evaluation of the devices' variable-gain ampli-
fier (VGA), I/Q demodulator, voltage-controlled oscilla-
tor (VCO), synthesizer, 3-wire programming interface,
and power-management features. Figure 2 shows the
MAX2312/MAX2316 EV kits schematic.

The EV kits provide 50

SMA connectors for all signal

inputs and outputs. A varactor-based tank circuit is pro-
vided for the on-chip VCO and can be tuned by a
potentiometer or an external voltage or phase locked
with the on-chip phase-locked loop (PLL). PC board
pads (J12, J13, J14, J15) are available for installing
low-inductance oscilloscope probe points, if desired.

Features

3-Wire Interface

Differential Baseband Outputs

+2.7V to +5.5V Single-Supply Operation

SMA Connectors on All Signal Ports

Low-Power Shutdown Mode

PC Control Software (available at
www.maxim-ic.com)

Evaluate: MAX2312/MAX2316

MAX2312/MAX2316 Evaluation Kits

________________________________________________________________

Maxim Integrated Products

19-1507; Rev 0; 8/99

Component List

PART

MAX2312

EVKIT

MAX2316

EVKIT

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

28 QSOP

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

Ordering Information

Note:

To evaluate the MAX2310 or MAX2314, order the

MAX2310EVKIT or MAX2314 EV KIT, respectively.

12pF ±5%, 25V min ceramic capaci-
tors (0402) (MAX2312) or
18pF ±5%, 25V min ceramic
capacitors (0402) (MAX2316)

C6, C7

8.0pF ±5%, 25V min ceramic capacitors
(0402) (MAX2312) or
15pF ±5%, 25V min ceramic capacitor
(0402) (MAX2316)

C19, C20

1.5pF ±0.1pF ceramic capacitor (0402)
(MAX2312) or
5.0pF ±0.1pF ceramic capacitor (0402)
(MAX2316)

DESIGNATION

47pF ±10%, 25V min ceramic
capacitors (0402)

C1, C33, C34

DESCRIPTION

QTY

100

±5% resistors (0402)

R2, R6, R8, R14,

R16, R18, R35

3300pF 10%, 25V min ceramic
capacitor (0402)

C30

180nH ±10% inductor (MAX2312)
Coilcraft 20805CS-181TKBC or
680nH ±10% inductor (MAX2316)
Coilcraft 1008CS-681TKBC

18nH ±5% inductor (MAX2312)
Coilcraft 0805CS-180TJBC or
68nH ±5% inductor (MAX2316)
Coilcraft 0805CS-680TJBC

Balun transformer
Toko 458DB-1011

47k

±5% resistor (0402)

R22

10k

Bourns variable resistors

Digi-Key 3296W-104-ND

R13, R24

680

±5% resistor (0402)

49.9

±1% resistor (0402)

10k

±5% resistors (0402)

R4, R5, R23

±5% resistors (0402)

R3, R10

DESIGNATION

DESCRIPTION

QTY

resistors (0402)

R1, R11, R12,

R31R34

0.01µF ±10%, 25V min ceramic
capacitors (0402)

C3, C9, C10,

C11, C13, C14,
C16, C21, C22,
C28, C35, C37,

C38, C42

330pF ±10%, 25V min ceramic
capacitors (0402)

C2, C4, C8, C12,

C23, C24, C25

Open

C15, C26, C32,

C36, C39, C40

10µF ±10%, 16V min tantalum capacitor
AVX TAJC106K016

C27

Open

R15, R17, R19,
R20, R21, R25,

R27R30, R36

0.033µF ±10%, 25V min ceramic
capacitor (0402)

C29

Evaluate: MAX2312/MAX2316

MAX2312/MAX2316 Evaluation Kits

_______________________________________________________________________________________

Quick Start

The MAX2312/MAX2316 EV kits are fully assembled
and factory tested. Follow the instructions in the
Connections and Setup section.

Recommended Test Equipment

The test equipment recommended to verify
MAX2312/MAX2316 operation is listed in Table 1. This
list is intended as a guide only; substitutions may be
possible.

Connections and Setup

The following sections provide instructions for running
the EV kits in CDMA mode.

CDMA Mode

Perform the following steps to evaluate the MAX2312/
MAX2316 in CDMA mode:

1) Verify that shunts JU3, JU10, and JU11 are in place.

2) Connect the INTF2300 interface cable as shown in

Figure 1. (Pin 1 of the interface cable corresponds
to the red wire; pin 1 is designated in silk screen on
each of the PC boards.)

3) Connect a +2.75V power supply to the V

and

GND terminals.

4) Install and run Maxim's CDMA control software

(available at www.maxim-ic.com). Click on the
CDMA control software on the windows task bar.
On the IC selection form, click on the MAX2312/
MAX2316 control button.

5) With the MAX2312/MAX2316 control screen active,

bring the DIVSEL pin high by clicking on the "H"
control button located near the middle of the screen
if testing a MAX2312. If testing a MAX2316, click
on "L."

6) With the MAX2312/MAX2316 control screen active,

bring the SHDN pin high by clicking on the "H" con-
trol button located near the middle of the screen.

EQUIPMENT

DESCRIPTION

RF Signal Generators
(2)

HP 8648A or equivalent. Capable of
delivering -70dBm to -10dBm of out-
put power in the 10MHz to 500MHz
frequency range. One generator is
required to test the receive signal
path, and the other is for the refer-
ence frequency.

Component List (continued)

Oscilloscope

For viewing the demodulator outputs,
3-wire serial interface, and other
functions

SUPPLIER

PHONE

FAX

Alpha Industries

617-935-5150

617-933-2359

AVX

803-946-0690

803-626-3123

Coilcraft

847-639-6400

847-639-1469

Digi-Key

218-681-6674

218-681-3380

Toko

708-297-0070

708-699-1194

Component Suppliers

Windows95 and Windows98 are registered trademarks of
Microsoft Corp.

Table 1. Recommended Equipment

270nH inductor
Coilcraft 0805CS-271 XKBC

Open

3-wire programming and interface
board

INTF2300

Board

20-pin ribbon cable

None

MAX2310/MAX2312/MAX2314/
MAX2316 data sheet

None

MAX2312/MAX2316 circuit board

None

DESIGNATION

MAX2312EEI or MAX2316EEI

Varactor diode
Alpha SMV1255-003

Open

DESCRIPTION

QTY

Open

Power Supply

Capable of providing at least 100mA
at +2.7V to +5.5V

Additional Voltage
Source for External
Control of VGA
Functions

Optional

Personal Computer

486DX33 or better, with Windows95

or Windows98

operating system

and a functional parallel port

SMA connectors (edge-mount)
E.F. Johnson 142-0701-801

J1J5, J7, J8

Shunts

JU3, JU10, JU11

7) For the MAX2312 only, in the control register,

change the VCOSEL bit to "1" and press "Send
Data." For the MAX2316, in the control register, set
the VCOSEL bit to "0" and press "Send Data."

8) Connect a function generator to the REF port con-

figured for a sine wave with a 19.68MHz frequency
and a -10dBm amplitude. (The REF port is 50

ter-

minated.)

9) Connect a signal generator with 210.48MHz

(MAX2312) or 85.48MHz (MAX2316) at -66dBm,
and apply to the CDMA DIFF port.

10) Set the VGC control to 2.5VDC by rotating poten-

tiometer R13.

11) Configure an oscilloscope to measure a high-

impedance, 1Vp-p, 100kHz differential waveform.
Connect it to the I or Q output.

Voltage gain can be calculated by:

Gain = approximately 60dB

Note:

The balun loss is not taken into account. This

loss is typically 0.5dB.

Adjustments and Control

VGC Adjust

The MAX2312/MAX2316 EV kits are configured with a
10k

trim pot for setting and adjusting the VGC gain.

An external supply can be used by removing the 2-pin
shunt JU3 and by directly connecting the supply to
JU2. The VGC voltage must be clean to minimize unde-
sired amplitude modulation.

VCO Adjust

The MAX2312/MAX2316 EV kits are configured with a
10k

trim pot for setting and adjusting the VCO volt-

age. Apply a 2-pin shunt to the VCO potentiometer and
external VCO header (JU1). Place a 0

resistor in R25

and remove R1 to break the loop and remove the
charge-pump output. The VCO voltage must be clean
to minimize undesired frequency modulation.

Interface Control

The interface port is designed to use a 20-pin ribbon
cable (Figure 1). Ten pins are signal lines, and the
other 10 pins are digital grounds. Pin 1 of the interface
cable is red. Pin 1 is also designated in silk screen on
each of the PC boards.

Detailed Description

The following sections cover the EV kits' circuit blocks
in detail. (Refer to the MAX2310/MAX2312/MAX2314/
MAX2316 data sheet for additional information.)

CDMA Inputs

The CDMA+ and CDMA- pins are differential inputs to
the MAX2312/MAX2316's VGA. The EV kit is configured
for single-ended (50

) operation at the CDMA DIFF

input connector. (The on-board balun converts this
input to a differential signal for the MAX2312/
MAX2316.) The impedance is set by the combination of
L4, R9, C19, C20, and the 4:1 impedance ratio of the
input balun.

REF Inputs

The REF port is AC-coupled and terminated for use
with a 50

signal source.

I/Q Outputs

The I/Q outputs are self-biased baseband outputs.

PC Board Layout/Construction

The MAX2312/MAX2316 EV kits can serve as board
layout guides. Keep PC board trace lengths as short as
possible to minimize parasitics. Keep decoupling
capacitors close to the device, with a low-inductance
via connection to the ground plane.

The MAX2312/MAX2316 EV kits' PC boards use 14mil-
wide traces for 50

traces. The PC board has an 8mil-

layer profile on FR4, with a 4.5 dielectric and 75mil
trace-to-ground-plane spacing.

Gain

20log

2 2

OUTp p

Evaluate: MAX2312/MAX2316

MAX2312/MAX2316 Evaluation Kits

_______________________________________________________________________________________

V (RMS)

1/2 10

PIN(dBm)

Evaluate: MAX2312/MAX2316

MAX2312/MAX2316 Evaluation Kits

_______________________________________________________________________________________

GND

DB25M

TO PC

PARALLEL

PORT

JU1

DUT

INTF2300

MAX2310
MAX2314

Figure 1. INTF2300 Interface Board

Interface Board INTF2300

Interface Board

The INTF2300 interface board is used to control the 3-
wire interface of a device under test from the parallel
port of a PC. This board level translates 5V logic from
the PC to V

of the device under test. The INTF2300

also provides buffering and EMI filtering. The recom-
mended operating supply voltage range is +2.7V to
+3.6V. For operation of the MAX2312/MAX2316 above
+3.6V, jumper JU1 may be removed and an external
supply voltage of +3.6V may be applied between V

(pin 2) and GND (pin 1) (Figure 1).

Evaluate: MAX2312/MAX2316

MAX2312/MAX2316 Evaluation Kits

_______________________________________________________________________________________

Figure 2. MAX3212/MAX3216 EV Kits Schematic

MAX2312

MAX2316

GND

BYP

10k

47pF

C16

0.01

C29

0.033

C30

3300pF

R23

10k

CPOUT

GND

DIVSEL

LOOUT

VGC

CDMA-

CDMA+

VGC

DATA

CLK

GND

REF

TANKH+

TANKH-

STBY

DIVSEL

BUFEN

SHDN

C10

0.01

REF

IOUT+

IOUT-

49.9

R10

R31

R32

0.01

C11

0.01

C13

0.01

C14

0.01

JU2

R13

10k

JU3

R12

TOKO

4458D8-1011

C19

C20

680

CDMA DIFF

C21

0.01

LOCK

R22

47k

R33

QOUT-

CLK

LOCK

DATA

QOUT+

R34

C35

0.01

C22

0.01

LOOUT

IOUT+

IOUT-

QOUT-

QOUT+

BYP

SHDN

STBY

BUFEN

C36

OPEN

R24

10k

JU1

MAX2316

MAX2312

15pF

C19

8pF

15pF

C20

8pF

680nH

180nH

COMPONENT

MAX2316

MAX2312

5.0pF

1.5pF

18pF

C6, C7

12pF

68nH

18nH

COMPONENT

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