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Part: MAX2721
Category:
RF & Microwaves
-> Multifunction
Description: 1.7ghz to 2.5ghz, Direct I/q Modulator With Vga And pa Driver
Company: Maxim Integrated Products
Datasheet: Download MAX2721 datasheet File size : 514 kB
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Datasheet text preview:
19-1606; Rev 0; 1/00
1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver
General Description
The MAX2720/MAX2721 are low-cost, high-performance, direct I/Q modulators designed for use in widebandCDMA and wireless local-loop (WLL) systems. Their direct-upconversion architecture reduces system cost, c o m p o n e n t count, and board space compared to devices with dual-conversion architectures. The MAX2720/MAX2721 include an I/Q modulator, a variable gain amplifier (VGA), and a power amplifier (PA) driver. The quadrature modulator accepts differential baseband I/Q signals and directly modulates an RF carrier in the 1.7GHz to 2.1GHz range (MAX2720) or the 2.1GHz to 2.5GHz range (MAX2721). The VGA provides 35dB of output power control. The modulator's amplitude and phase balance yield 35dBc of sideband suppression and 30dBc of carrier suppression. These devices feature an LO frequency doubler that allows the external LO source to operate at half-frequency or full-frequency when disabled. The MAX2720/MAX2721 operate from a single +2.7V to +3.3V supply and require only 77mA (MAX2720) or 8 6 m A (MAX2721) of supply current. An additional 2 0 m A of supply current is saved by disabling the stand-alone PA driver. A low-power shutdown mode further reduces supply current to less than 0.1µA. The device is packaged in the small 20-pin TSSOP-EP with exposed paddle to improve RF performance. o RF Frequency Range 1.7GHz to 2.1GHz (MAX2720) 2.1GHz to 2.5GHz (MAX2721) o Integrated I/Q Modulator, LO Doubler, VGA, and PA Driver o 35dB VGA Gain Control Range o 35dBc Sideband Suppression o 30dBc Carrier Suppression o Low Supply Current 77mA (MAX2720), 86mA (MAX2721) 20mA Reduction with PA Driver Disabled o 0.1µA Supply Current in Shutdown Mode o +2.7V to +3.3V Single-Supply Operation
Features
MAX2720/MAX2721
Ordering Information
PART MAX2720EUP MAX2721EUP *Exposed paddle. TEMP. RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 TSSOP-EP* 20 TSSOP-EP*
Applications
Wireless Local Loop (WLL) Wideband CDMA Systems LMDS/MMDS 2.4GHz Broadband ISM Radios DCS/PCS Base Stations
GND 1 DROUT 2
Functional Diagram
MAX2720/MAX2721
PA DRIVER VGA SHDN 3 VCC 4 GND 5 90° VCC 6 I- 7 I+ 8 LO PHASE SHIFTER 0° 15 VCC 14 Q13 Q+ 12 VCC x2 LO DOUBLER 11 LO 18 PC 17 MODOUT 16 ENX2 20 DRIN 19 GND
Pin Configuration appears at end of data sheet.
VCC 9 GND 10
BIAS
________________________________________________________________ Maxim Integrated Products
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For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver MAX2720/MAX2721
ABSOLUTE MAXIMUM RATINGS
VCC to GND .....-0.3V to +6V ENX2, SHDN, PC, I+, I-, Q+, Q-, LO, DRIN to GND .......-0.3V to (VCC + 0.3V) ENX2, SHDN Continuous Current....±10mA PC Continuous Current.....±10mA I+ to I-, Q+ to Q- ...........±2V MODOUT, DROUT to GND Short-Circuit Duration ........10s Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP-EP (derate 21.7mW/°C above +70°C) ......1.74W Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .... -65°C to +150°C Lead Temperature (soldering 10s) ......... +300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +3.3V; SHDN = VCC; ENX2 = GND; VPC = 0.5V; no input AC signals applied to I+, I-, Q+, Q-, LO, DRIN. MODOUT and DROUT = VCC, TA = -40°C to +85°C. Typical values are at VCC. = +3V, TA = +25°C, unless otherwise noted.) PARAMETER Supply Voltage Supply Current Supply Current with PA Driver Disabled Shutdown Supply Current Logic Input High Voltage Logic Input Low Voltage Logic Input Bias Current PC Input Bias Current 0.5V < VPC < 2.5V 0.5V < VPC < 2.5V, SHDN = GND -1 -5 2.5 MAX2720 MAX2721 MAX2720, DRIN = GND MAX2721, DRIN = GND SHDN = GND 2.0 0.5 1 5 CONDITIONS MIN 2.7 77 86 59 67 0.1 TYP MAX 3.3 119 129 86 96 10 UNITS V mA mA µA V V µA µA
AC ELECTRICAL CHARACTERISTICS
(MAX2720/MAX2721 EV Kit, VCC = +3.0V, SHDN = VCC, ENX2 = GND, VPC = 2.5V, input I/Q signals driven in quadrature, from a 1k source impedance, single-ended, fI+ = fQ+ = 500kHz, VI+ = VQ+ = 200mVp-p, PLO = -13dBm, fLO = 950MHz (MAX2720), fLO = 1157.5MHz (MAX2721), PDRIN = -12dBm, fDRIN = 1900MHz (MAX2720), fDRIN = 2315MHz (MAX2721), MODOUT and DROUT ports are matched to a 50 load, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER I/Q BASEBAND INPUTS I/Q Input -1dB Bandwidth (Note 2) I/Q Input -3dB Bandwidth (Note 2) I/Q Differential Input Level I/Q Gain Imbalance I/Q Phase Imbalance I/Q Input Resistance I/Q Input Resistance Mismatch I/Q Input Capacitance Group Delay Ripple Group Delay Mismatch fI = fQ < BW-3dB, 0.5V < VPC < 2.5V fI = fQ < BW-3dB, 0.5V < VPC < 2.5V fI = fQ < BW-1dB fI = fQ < BW-1dB fI = fQ < BW-1dB 100kHz < fI+ = fQ+ < 2MHz 100kHz < fI = fQ < 2MHz 1.6 14 20 40 200 ±0.2 ±1.0 2.0 18 5 1 1 630 MHz MHz mVp-p dB degrees k pF ns ns CONDITIONS MIN TYP MAX UNITS
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1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2720/MAX2721 EV Kit, VCC = +3.0V, SHDN = VCC, ENX2 = GND, VPC = 2.5V, input I/Q signals driven in quadrature, from a 1k source impedance, single-ended, fI+ = fQ+ = 500kHz, VI+ = VQ+ = 200mVp-p, PLO = -13dBm, fLO = 950MHz (MAX2720), fLO = 1157.5MHz (MAX2721), PDRIN = -12dBm, fDRIN = 1900MHz (MAX2720), fDRIN = 2315MHz (MAX2721), MODOUT and DROUT ports are matched to a 50 load, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER MODULATOR OUTPUT Frequency Range (Note 3) MAX2720 MAX2721 MAX2720, VPC = 2.5V, ENX2 = VCC or GND, TA = +25°C (Note 3) MAX2721, VPC = 2.5V, ENX2 = VCC or GND, TA = +25°C (Note 3) VPC = 2.5V, TA = -40°C to +85°C VPC = 0.5V, ENX2 = VCC or GND MAX2720 MAX2721 MAX2720 MAX2721 MAX2720 MAX2721 MAX2720 MAX2721 29 28 +1 +3 +8 +9 1700 2100 -12.5 -10.5 -8.5 -5.0 ±1.0 ±0.8 35 32 19 +5 +6 +14 +14 2:1 -141 26 24 20 30 28 33 31 25 40 35 50 VCC = +3.0V + 100mVp-p at 10kHz/300kHz 41 45 dBc dB dBc dBc -137 dBm/Hz 23 2100 2500 -6.0 dBm -2.5 ±1.8 ±1.5 dB dB dB/V dBm dBm MHz CONDITIONS MIN TYP MAX UNITS
MAX2720/MAX2721
Output Power, High
Output Power Variation Over Temperature Power Control Range PC Slope Output 1dB Compression Point Output Third-Order Intercept Point (Note 4) Output VSWR Out-of-Band Noise Density Carrier Suppression
Slope between VPC = 1V and VPC = 2V VPC = 2.5V VPC = 2.5V 0.5V < VPC < 2.5V VPC = 2.5V, I/Q terminated in 50 MAX2720, 0.5V < VPC < 2.5V MAX2721 0.5V < VPC < 2.5V VPC = 2.5V VPC = 0.5V MAX2720 MAX2721
Sideband Suppression MODOUT to LO Input Isolation Power-Supply Ripple Rejection (Note 5)
LO BUFFER, LO FREQUENCY DOUBLER, QUADRATURE GENERATOR MAX2720 LO Frequency Range (Note 3) MAX2721 MAX2720 LO Input VSWR MAX2721 LO Input Power (Note 3) ENX2 = GND ENX2 = VCC ENX2 = GND ENX2 = VCC ENX2 = GND ENX2 = VCC ENX2 = GND ENX2 = VCC -16 850 1700 1050 2100 1.9:1 1.8:1 1.8:1 1.6:1 -10 dBm 1050 2100 1250 2500 MHz
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