Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX1005CEE+

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_______________General Description

The MAX1005 is a combined digitizer and reconstruc-

tion integrated circuit designed to work in systems that

demodulate and modulate communications signals. It

integrates IF undersampling and signal synthesis func-

tions into a single, low-power circuit. Its analog-to-

digital converter (ADC) is used to directly sample or

undersample a downconverted RF signal, while its

digital-to-analog converter (DAC) recreates the IF sub-

carrier and transmission data. The MAX1005’s ADC is

ideal for undersampling applications, due to the analog

input amplifier’s wide (15MHz) bandwidth. The DAC

has very low glitch energy, which minimizes the trans-

mission of unwanted spurious signals. An on-chip

reference provides for low-noise ADC and DAC conver-

sions.

The MAX1005 provides a high level of signal integrity

from a low power budget. It operates from a single

power supply, or from separate analog and digital sup-

plies with independent voltages ranging from +2.7V to

+5.5V. The MAX1005 can operate with an unregulated

analog supply of 5.5V and a regulated digital supply

down to 2.7V. This flexible power-supply operation

saves additional power in complex digital systems.

The MAX1005 has three operating modes: transmit

(DAC active), receive (ADC active), and shutdown

(ADC and DAC inactive). In shutdown mode, the total

supply current drops below 1µA. The device requires

only 2.4µs to wake up from shutdown mode. The

MAX1005 is ideal for hand-held, as well as base-station

applications. It is available in a tiny 16-pin QSOP pack-

age specified for operation over both the commercial

and extended temperature ranges.

________________________Applications

PWT1900

PHS/P

Wireless Loops

PCS/N

____________________________Features

♦ Differential-Input, 5-Bit ADC

♦ Differential-Output, 7-Bit DAC

♦ 15Msps Min Conversion Rate

♦ 25MHz -1dB Full-Power Bandwidth

♦ 44dB SFDR for ADC

39dB at 10.7MHz SFDR (Imaged) for DAC

♦ Internal Voltage Reference

♦ Parallel Logic Interface

♦ Single-Supply Operation (+2.7V to +5.5V)

♦ 0.1µA Low-Power Shutdown Mode

MAX1005

IF Undersampler

________________________________________________________________

Maxim Integrated Products

VCCD CLK

TOP VIEW

MAX1005

QSOP

DGND

RXEN

TXEN

AIO+

AIO-

AGND

VCCA

__________________Pin Configuration

19-1291; Rev 0; 9/97

PART

MAX1005CEE

MAX1005EEE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

______________Ordering Information

Functional Diagram appears at end of data sheet.

Summary of content (8 pages)

PAGE 1
9-1291; Rev 0; 9/97 IF Undersampler The MAX1005 provides a high level of signal integrity from a low power budget. It operates from a single power supply, or from separate analog and digital supplies with independent voltages ranging from +2.7V to +5.5V. The MAX1005 can operate with an unregulated analog supply of 5.5V and a regulated digital supply down to 2.7V. This flexible power-supply operation saves additional power in complex digital systems.
PAGE 2
MAX1005 IF Undersampler ABSOLUTE MAXIMUM RATINGS VCCA to AGND ........................................................-0.3V, +6.0V VCCD to DGND ........................................................-0.3V, +6.0V VCCA to VCCD ...................................................................±6.3V Digital I/O Pins (D0–D6, CLK, RXEN, TXEN) to DGND .................................-0.3V to (VCCD + 0.3V) or 6.0V (whichever is smaller) Analog I/O Pins (AIO+, AIO-) to AGND................................
PAGE 3
IF Undersampler MAX1005 ELECTRICAL CHARACTERISTICS (continued) (VCCA = VCCD = 3.0V, fCLK = 15MHz, RL = ∞, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL Input Full-Power Bandwidth (-1dB) CONDITIONS VIN = 90% of full scale Conversion Rate MIN TYP 15 25 MAX MHz 15 Wakeup Time Exiting Shutdown Mode Power-Supply Rejection Msps tWAKE PSR 0.6 VCC_ (A or D or both) = 3.0V ±100mVp-p at 100kHz UNITS 2.4 <0.
PAGE 4
MAX1005 IF Undersampler ELECTRICAL CHARACTERISTICS (continued) (VCCA = VCCD = 3.0V, fCLK = 15MHz, RL = ∞, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS CONDITIONS D0–D6, CLK; VCCD = 2.7V to 5.5V Input Current Input Capacitance IIN CIN MIN TYP -1 MAX UNITS 7 RXEN, TXEN; VCCD = 2.7V to 3.6V TXEN = RXEN ±1 TXEN = 0 and RXEN = 1, or TXEN = 1 and RXEN = 0 ±2 RXEN, TXEN; VCCD = 3.6V to 5.
PAGE 5
IF Undersampler RECEIVE ADC DIFFERENTIAL NONLINEARITY 0.40 0.4 0.3 0.20 0.20 0.2 0.10 0.10 0.1 0.00 -0.10 0 -0.1 -0.20 -0.20 -0.2 -0.30 -0.30 -0.3 -0.40 -0.40 -0.4 -0.50 -0.50 -6 -3 0 3 6 9 12 15 -0.5 -15 -12 -9 -6 -3 0 3 6 9 12 15 -64 -32 -16 0 16 32 CODE CODE TRANSMIT DAC DIFFERENTIAL NONLINEARITY RECEIVE ADC FFT PLOT FULL POWER ANALOG INPUT BANDWIDTH 0.4 fIN = 10.7MHz fCLK = 15MHz 256 POINTS 20 10 AMPLITUDE (dB) 0.2 0.1 0 -0.1 0 -10 -20 -30 -0.
PAGE 6
MAX1005 IF Undersampler ______________________________________________________________Pin Description PIN NAME 1 VCCD Digital Supply Voltage, +2.7V to +5.5V 2 DGND Digital Ground. Connect to digital ground plane. 3 RXEN Receive ADC Enable Input. A logic-high level on this input combined with a logic-low level on TXEN enables the receive ADC and disables the transmit DAC. If RXEN = TXEN, the MAX1005 enters its low-power shutdown mode. 4 AIO+ Positive Analog Input/Output Pin.
PAGE 7
IF Undersampler 01110 SAMPLE n+1 SAMPLE n+2 CLK 00010 OUTPUT CODE SAMPLE n ANALOG INPUT MAX1005 01111 00001 00000 D0–D4 n-1 11111 n n+1 tDO 11110 11101 Figure 3. Receive ADC Timing Diagram 10001 Operating Modes 10000 The MAX1005 has three operating modes: transmit, receive, and shutdown. The operating mode is selected by the RXEN and TXEN inputs, as shown in Table 2. In transmit mode, the DAC is active and the ADC is inactive. Power consumption is typically 16.
PAGE 8
Power-Supply Bypassing and Grounding The MAX1005 has separate analog (VCCA) and digital (VCCD) power-supply connections, as well as separate analog and digital ground connections to minimize coupling of noisy digital signals into the circuit’s analog portion. The device will operate with both of these power supplies connected to any voltage between +2.7V and +5.5V.