19-1507; Rev 0; 8/99
MAX2312/MAX2316 Evaluation Kits
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 50Ω 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.
o
3-Wire Interface
o
Differential Baseband Outputs
o
+2.7V to +5.5V Single-Supply Operation
o
SMA Connectors on All Signal Ports
o
Low-Power Shutdown Mode
o
PC Control Software (available at
www.maxim-ic.com)
Features
Evaluate: MAX2312/MAX2316
Ordering Information
PART
MAX2312EVKIT
MAX2316EVKIT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
Note:
To evaluate the MAX2310 or MAX2314, order the
MAX2310EVKIT or MAX2314 EV KIT, respectively.
Component List
DESIGNATION QTY
C1, C33, C34
C2, C4, C8, C12,
C23, C24, C25
C3, C9, C10,
C11, C13, C14,
C16, C21, C22,
C28, C35, C37,
C38, C42
3
7
DESCRIPTION
47pF ±10%, 25V min ceramic
capacitors (0402)
330pF ±10%, 25V min ceramic
capacitors (0402)
DESIGNATION QTY
C30
R1, R11, R12,
R31–R34
R2, R6, R8, R14,
R16, R18, R35
R3, R10
R4, R5, R23
R7
C5
1
1.5pF ±0.1pF ceramic capacitor (0402)
(MAX2312) or
5.0pF ±0.1pF ceramic capacitor (0402)
(MAX2316)
12pF ±5%, 25V min ceramic capaci-
tors (0402) (MAX2312) or
18pF ±5%, 25V min ceramic
capacitors (0402) (MAX2316)
Open
8.0pF ±5%, 25V min ceramic capacitors
(0402) (MAX2312) or
15pF ±5%, 25V min ceramic capacitor
(0402) (MAX2316)
10µF ±10%, 16V min tantalum capacitor
AVX TAJC106K016
0.033µF ±10%, 25V min ceramic
capacitor (0402)
L4
1
R9
R13, R24
R15, R17, R19,
R20, R21, R25,
R27–R30, R36
R22
T1
1
8
6
2
3
1
1
2
DESCRIPTION
3300pF 10%, 25V min ceramic
capacitor (0402)
0Ω resistors (0402)
100Ω ±5% resistors (0402)
68Ω ±5% resistors (0402)
10kΩ ±5% resistors (0402)
49.9Ω ±1% resistor (0402)
680Ω ±5% resistor (0402)
10kΩ Bourns variable resistors
Digi-Key 3296W-104-ND
Open
47kΩ ±5% resistor (0402)
Balun transformer
Toko 458DB-1011
18nH ±5% inductor (MAX2312)
Coilcraft 0805CS-180TJBC or
68nH ±5% inductor (MAX2316)
Coilcraft 0805CS-680TJBC
180nH ±10% inductor (MAX2312)
Coilcraft 20805CS-181TKBC or
680nH ±10% inductor (MAX2316)
Coilcraft 1008CS-681TKBC
1
14
0.01µF ±10%, 25V min ceramic
capacitors (0402)
C6, C7
2
11
1
1
C15, C26, C32,
C36, C39, C40
6
C19, C20
2
L2
1
C27
C29
1
1
________________________________________________________________
Maxim Integrated Products
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.
MAX2312/MAX2316 Evaluation Kits
Evaluate: MAX2312/MAX2316
Component List (continued)
DESIGNATION QTY
L6
J1–J5, J7, J8
JU3, JU10, JU11
J6
Q1
D1
D4
U1
None
None
None
INTF2300
Board
1
7
3
1
1
1
1
1
1
1
1
1
DESCRIPTION
270nH inductor
Coilcraft 0805CS-271 XKBC
SMA connectors (edge-mount)
E.F. Johnson 142-0701-801
Shunts
Open
Open
Open
Varactor diode
Alpha SMV1255-003
MAX2312EEI or MAX2316EEI
MAX2312/MAX2316 circuit board
MAX2310/MAX2312/MAX2314/
MAX2316 data sheet
20-pin ribbon cable
3-wire programming and interface
board
Personal Computer
Additional Voltage
Source for External
Control of VGA
Functions
Optional
Oscilloscope
RF Signal Generators
(2)
Table 1. Recommended Equipment
EQUIPMENT
DESCRIPTION
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.
For viewing the demodulator outputs,
3-wire serial interface, and other
functions
Capable of providing at least 100mA
at +2.7V to +5.5V
Power Supply
486DX33 or better, with Windows95
®
or Windows98
®
operating system
and a functional parallel port
Component Suppliers
SUPPLIER
Alpha Industries
AVX
Coilcraft
Digi-Key
Toko
PHONE
617-935-5150
803-946-0690
847-639-6400
218-681-6674
708-297-0070
FAX
617-933-2359
803-626-3123
847-639-1469
218-681-3380
708-699-1194
Windows95 and Windows98 are registered trademarks of
Microsoft Corp.
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
CC
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.
2
_______________________________________________________________________________________
MAX2312/MAX2316 Evaluation Kits
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 50Ω 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:
V
OUTp
−
p
Gain
=
20log
2 2 V
IN
V
IN
(RMS)
=
1/2
⋅
10
PIN(dBm)
PIN(dBm)
10
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.
Evaluate: MAX2312/MAX2316
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 (50Ω) 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
10
The REF port is AC-coupled and terminated for use
with a 50Ω signal source.
Gain = approximately 60dB
Note:
The balun loss is not taken into account. This
loss is typically 0.5dB.
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 50Ω traces. The PC board has an 8mil-
layer profile on FR4, with a 4.5 dielectric and 75mil
trace-to-ground-plane spacing.
Adjustments and Control
VGC Adjust
The MAX2312/MAX2316 EV kits are configured with a
10kΩ 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
10kΩ 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 0Ω 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.
_______________________________________________________________________________________
3
MAX2312/MAX2316 Evaluation Kits
Evaluate: MAX2312/MAX2316
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
CC
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
CC
(pin 2) and GND (pin 1) (Figure 1).
GND
JU1
1
DB25M
V
CC
2
3
1
1
TO PC
PARALLEL
PORT
6
20
10
INTF2300
10
DUT
MAX2310
MAX2314
V
CC
D
6
20
1
1
Figure 1. INTF2300 Interface Board
4
_______________________________________________________________________________________
V
CC
A
V
CC
A
V
CC
C16
0.01µF
R24
10k
26
STBY
GND
25
R23
10k
C29
R1
0Ω 0.033µF
C30
3300pF
C1
47pF
BYP
1 DR
BYP
C14
C13
0.01µF
0.01µF
28
27
STBY
C36
OPEN
JU1
MAX2312
MAX2316
C19
CDMA+
CDMA DIFF
L4
24
R9
680Ω
T1
J5
2 CPOUT
3 GND
DIVSEL
DIVSEL
CDMA-
5 TANKH+
D4
6
TANKH-
C21
0.01µF
VGC
C7
BUFEN
C3
0.01µF
8
LOOUT
V
CC
V
CC
A
DATA
DATA
EN
REF
CLK
18
CLK
C22
0.01µF
QOUT+ 17
19
20
V
CC
10 GND
11
R7
49.9Ω
SHDN
13 IOUT+
R31
0Ω
J2
14
IOUT-
R32
0Ω
C11
0.01µF
MAX2312
1.5pF
12pF
18nH
V
CC
R22
47k
COMPONENT MAX2316
C5
C6, C7
L2
68nH
18pF
5.0pF
C9
0.01µF
LOCK
15
LOCK
QOUT-
16
C35
0.01µF
R33
0Ω
COMPONENT MAX2316
C19
C20
L4
15pF
15pF
680nH
MAX2312
8pF
8pF
180nH
J8
QOUT-
12 SHDN
J1
9
21
V
CC
D
C10
0.01µF
7
BUFEN
22
R12
0Ω
JU3
JU2
C5
L2
C20
TOKO
4458D8-1011
23
R4
10k
C6
Figure 2. MAX3212/MAX3216 EV Kits Schematic
4
V
CC
R5
10k
R13
10k
VGC
J4
R3
68Ω
R10
68Ω
J3
EN
R34
0Ω
J7
QOUT+
LOOUT
REF
IOUT+
Evaluate: MAX2312/MAX2316
_______________________________________________________________________________________
IOUT-
MAX2312/MAX2316 Evaluation Kits
5
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