MAXIM MAX1002, MAX1003 Technical data

_________________________Quick Start

The MAX1002/MAX1003 EV kits are fully assembled
and tested. Follow these steps to verify proper board
operation. Do not turn on the power supplies until all

connections to the EV kit are completed.

1) Connect a +5V power supply to the pad marked
VCC. Connect this supply’s ground to the pad
marked GND.

2) Connect a +3.3V (MAX1003) or +5V (MAX1002)
power supply to the pad labeled VCCO. Connect
the supply ground to the pad marked OGND.

3) Connect a +4V power supply to the pad marked
VTUNE. Connect the supply ground to the GND
pad.

4) Remove the shunt from jumper JU5. This sets a
250mVp-p full-scale range.

_______________General Description

The MAX1002/MAX1003 evaluation kits (EV kits) simplify
evaluation of the 60Msps MAX1002 and 90Msps
MAX1003 dual, 6-bit analog-to-digital converters (ADCs).
The kits include the basic components necessary to
operate the on-chip oscillator as a voltage-controlled
oscillator (VCO). Each board can also be easily modified
to accommodate an external clocking source.

Connectors for power supplies, analog inputs, and digital
outputs simplify connections to the device. The PC board
features an optimized layout to ensure the best possible
dynamic performance. The EV kits include a MAX1002 or
MAX1003.

____________________________Features

♦ 5.85 Effective Number of Bits at 20MHz Analog

Input Frequency

♦ Separate Analog and Digital Power and Ground

Connections with Optimized PC Board Layout

♦ Matched Single-Ended or Differential Analog

Inputs for Both I and Q Channels

♦ Square-Pin Header for Easy Connection of Logic

Analyzer to Digital Outputs

♦ User-Selectable ADC Full-Scale Gain Ranges
♦ Fully Assembled and Tested

Evaluate: MAX1002/MAX1003

MAX1002/MAX1003 Evaluation Kits

________________________________________________________________

Maxim Integrated Products

1

19-1250; Rev 0; 6/97

QTY DESCRIPTION

C1, C10,

C11, C12

4

C2, C3,

C6, C7

4

C4, C15 2

0.22µF, 25V min, 10% ceramic
capacitors

C5 1

C8, C9,

C13, C14

4

0.1µF, 10V min, 10% ceramic
capacitors

R1 1

R2, R3 2

R4–R7 4

L1 1

220nH inductor
Coilcraft 1008CS-221TKBC

MAX1003CAX, 90Msps

D1 1

Varactor diode
M/A-COM MA4ST079CK-287, SOT23

IIN+, IIN-,

QIN+, QIN-

4 BNC connectors

None 1 MAX1002/MAX1003 circuit board

5pF, 10V min, 10% ceramic capacitor
(MAX1003)

47pF, 25V min, 5% ceramic capacitors

0.01µF, 25V min, 10% ceramic
capacitors

SUPPLIER* PHONE FAX

AVX [phone] [phone]

______________Component Suppliers

DESIGNATION

10kΩ, 5% resistor
47kΩ, 5% resistors

49.9Ω, 1% resistors

____________________Component List

______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

Coilcraft [phone] [phone]
M/A-COM [phone] [phone]
Sprague [phone] [phone]

JU1, JU2,

JU6, JU7

4 0Ω resistors

JU3, JU4,

JU8, JU9

4 2-pin headers

JU5 1 3-pin header

JU11 1 2-pin header (MAX1002 only)

J1 1 26-pin connector

None 1 Shunt for JU5

22pF, 10V min, 10% ceramic capacitor
(MAX1002)

U1 1

MAX1002CAX, 60Msps

*

Please indicate that you are using the MAX1002/MAX1003
when contacting these component suppliers.

PART

MAX1002EVKIT-SO
MAX1003EVKIT-SO 0°C to +70°C

0°C to +70°C

TEMP. RANGE BOARD TYPE

Surface Mount
Surface Mount

C16, C17 2

10µF, 10V min, 20% tantalum caps
AVX TAJC106K016

查询MAX1002EVKIT供应商

Evaluate: MAX1002/MAX1003

5) Using an RF power splitter-combiner, connect a
250mVp-p, 20MHz sine-wave source to both analog
inputs at BNC J3 and J6. The analog input imped­ance is 50Ω for each channel.

6) Connect a logic analyzer to connector J1 to monitor
the digital outputs.

7) Turn on all power supplies and signal sources.

8) Observe the digitized analog input signals with the
logic analyzer.

_______________Detailed Description

EV Kit Jumpers

The MAX1002/MAX1003 EV kits contain several
jumpers that control board and part options. The follow­ing sections describe the different jumpers and their
purposes. Table 1 lists the jumpers on the EV kits and
their default positions.

Table 1. EV Kit Jumpers and Default
Positions

Power Requirements

Both the MAX1002 and the MAX1003 require +5V at
about 65mA for their analog VCCsupply. Power-supply
requirements for the digital outputs, however, are differ­ent for the two devices. 0Ω resistors are installed at
jumper sites JU1, JU2, JU6, and JU7, and can be
removed to sense device power-supply currents with
an ammeter.

MAX1003 Digital Outputs Supply

The MAX1003 requires +3.3V for the V

CCO

supply. The
current requirement from the power supply is a function
of the sampling clock and analog input frequencies, as
well as the capacitive loading on the digital outputs.
With 15pF loads and a 20MHz analog input frequency
sampled at 90Msps, the current draw is about 10mA.

MAX1002 Digital Outputs Supply

The MAX1002 uses +5V for its V

CCO

supply. As with
the MAX1003, the current requirement is a function of
the analog input frequency and capacitive loading on
the outputs. With 15pF loads and a 20MHz analog input
sampling at 60Msps, the current requirement is about
13mA. You can also use a single power supply for both
the VCCand V

CCO

supplies by installing jumper JU11,
located near the EV kit power-supply connectors.
However, for best dynamic performance, use separate
analog and digital power supplies.

Analog Inputs

The analog inputs to the dual ADCs are provided
through BNC connectors IIN+, IIN-, QIN+, and QIN-.
The connectors are terminated with 49.9Ω to ground
and are AC coupled to the converter’s analog inputs,
which are internally self-biased at 2.35V DC. A typical
application circuit drives the IIN+ and QIN+ noninvert­ing analog inputs using AC-coupled in-phase and quad­rature signals. The nominal 20kΩ input resistance of the
analog inputs, plus the 0.1µF AC-coupling capacitor
value, sets the low-frequency corner at about 80Hz.

You can drive the analog inputs either single-ended or
differentially using AC- or DC-coupled inputs. Either the
inverting or the noninverting input can be driven single­ended. If the inverting input is driven, then the digital
output codes are inverted (complemented). Refer to the
MAX1002 or MAX1003 data sheet for typical circuits.

ADC Gain Selection

The single GAIN-select pin on the MAX1002 or
MAX1003 controls the full-scale input range for both the
I and the Q channels. Jumper JU5 is used to manually
select the desired gain range as shown in Table 2. The
EV kits are shipped with the mid-gain range selected
(jumper pins open).

Table 2. Gain-Selection Jumper JU5
Settings

MAX1002/MAX1003 Evaluation Kits

2 _______________________________________________________________________________________

Open

Offset-correction
amplifier enabled

JU3, JU4,

JU8, JU9

Shorted with 0Ω

resistors

Power-supply current­sense ports

JU1, JU2,

JU6, JU7

DEFAULT
POSITION

FUNCTIONJUMPER(S)

Open

VCCO tied to VCC for
single-supply operation
(MAX1002)

JU11

Open

ADC full-scale range
selection

JU5

Mid-gain, 250mVp-p

No pins shorted

Low-gain, 500mVp-pPins 1 and 2 shorted

ADC GAIN RANGECONNECTIONJU5 SETTING

High-gain, 125mVp-pPins 2 and 3 shorted

JU5

1
2
3

JU5

1
2
3

JU5

1
2
3

Table 3 lists the possible input-drive combinations for
the mid-gain (250mVp-p) full-scale range selection.
Drive levels are referenced to the open-circuit, com­mon-mode voltage of the analog inputs (typically

2.35V) if DC coupled, or to ground if AC coupling is
used. If the low-gain (500mVp-p) range is selected, the
input-drive requirements are twice those listed in Table

3. If the high-gain (125mVp-p) range is selected, the
input-drive requirements are half those listed in Table 3.

Table 3. Typical Input-Drive Requirements
for Mid-Gain

Offset-Correction Amplifiers

The offset-correction amplifiers included on the
MAX1002 and MAX1003 are usually enabled in a typi­cal AC-coupled application circuit. For DC-coupled
applications, the amplifiers must be disabled by
installing shorting blocks on jumpers JU3, JU4 (I chan­nel); and JU8, JU9 (Q channel). These jumpers short
device pins IOCC+ (pin 2), IOCC- (pin 3), QOCC- (pin

16), and QOCC+ (pin 17) to ground and disable the
amplifiers. The MAX1002/MAX1003 EV kits are config­ured with the offset-correction amplifiers enabled
(jumpers open) and AC-coupled analog inputs.

Voltage-Controlled-Oscillator Operation

The EV kits include a voltage-controlled-oscillator
(VCO) circuit to set the analog-to-digital converter
(ADC) sampling rate using an external resonant tank
and a varactor diode. A voltage applied to the VTUNE
pad changes the varactor diode’s capacitance to
adjust the tank’s resonant frequency, which sets the
oscillator’s sampling frequency. VTUNE voltage can be
varied from 0V to a maximum of 8V.

The EV kits are designed so that a nominal VTUNE con­trol voltage of about 4V sets the ADC sampling rate to
either 60Msps for the MAX1002 or 90Msps for the
MAX1003. The VTUNE control voltage should be well
filtered, as any noise on the supply contributes to jitter
in the internal oscillator and degrades the converters’
dynamic performance. Figures 1 and 2 show the
VTUNE control-voltage typical frequency-adjustment
ranges for the MAX1002 and MAX1003 EV kits, respec­tively.

Evaluate: MAX1002/MAX1003

MAX1002/MAX1003 Evaluation Kits

_______________________________________________________________________________________ 3

INPUT DRIVE

Single-Ended

Noninverting

0

+125mV

QIN+ or IIN+

-125mV

Open Circuit

Open Circuit

QIN- or IIN-

Open Circuit

100000

111111

OUTPUT

CODE

000000

Open Circuit

Open Circuit

Open Circuit

0

+125mV

-125mV

Single-Ended

Inverting

011111

000000

111111

0

+62.5mV

-62.5mV

0

-62.5mV

+62.5mV

Differential

100000

111111

000000

Figure 1. MAX1002 Oscillator Frequency vs. VTUNE Control
Voltage

60

70
65

80
75

90
85

95

105
100

110

0 2 31 4 5 6 7 8

MAX100/1003-fig2

VTUNE CONTROL VOLTAGE (V)

FREQUENCY (MHz)

Figure 2. MAX1003 Oscillator Frequency vs. VTUNE Control
Voltage

70
68
66
64
62
60
58

FREQUENCY (MHz)

56
54
52
50

0 2 31 4 5 6 7 8

VTUNE CONTROL VOLTAGE (V)

MAX100/1003-fig1