Analog Devices AD6630 Datasheet

a		Differential, Low Noise IF Gain
		Block with Output Clamping
		AD6630

FEATURES

24 dB Gain

4 dB Noise Figure

Easy Match to SAW Filters

Output Limiter Adjustable +8.5 dBm to +12 dBm 700 MHz Bandwidth

10 V Single or Dual 5 V Power Supply

300 mW Power Dissipation

APPLICATIONS

ADC IF Drive Amp

Communications Receivers

PCS/Cellular Base Stations

GSM, CDMA, TDMA

FUNCTIONAL BLOCK DIAGRAM

NC	1	AD6630	16	VCC
NC	2		15	CD1
IP2	3	+	14	OP
		+
IP1	4	+	13	VEE
IP1	5		12	CMD
IP2	6		11	OP
CLLO	7		10	CD2
CLHI	8		9	VCC

NC = NO CONNECT

PRODUCT DESCRIPTION

The AD6630 is an IF gain block designed to interface between SAW filters and differential input analog-to-digital converters. The AD6630 has a fixed gain of 24 dB and has been optimized for use with the AD6600 and AD6620 in digitizing narrowband IF carriers in the 70 MHz to 250 MHz range.

Taking advantage of the differential nature of SAW filters, the AD6630 has been designed as a differential in/differential out gain block. This architecture allows 100 dB of adjacent channel blocking using low cost SAW filters. The AD6630 provides output limiting for ADC and SAW protection with ,10° phase variation in recovery from overdrive situations.

Designed for “narrow-band” cellular/PCS receivers, the high linearity and low noise performance of the AD6630 allows for implementation in a wide range of applications ranging from

GSM to CDMA to AMPS. The clamping circuitry also maintains the phase integrity of an overdriven signal. This allows phase demodulation of single carrier signals with an overrange signal.

While the AD6630 is optimized for use with the AD6600 Dual Channel, Gain Ranging ADC with RSSI, it can also be used in many other IF applications. The AD6630 is designed with an input impedance of 200 Ω and an output of 400 Ω. In the typical application shown below, these values match the real portion of a typical SAW filter. Other devices can be matched using standard matching network techniques.

The AD6630 is built using Analog Devices’ high speed complementary bipolar process. Units are available in a 300 mil SOIC (16 leads) plastic surface mount package and specified to operate over the industrial temperature range (–40°C to +85°C).

		AD6630
		MAIN
	LOCAL	AD6600	AD6620	DSP
	OSCILLATOR
		AD6630
		DIVERSITY

Figure 1. Reference Design

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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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Tel: [phone]	World Wide Web Site: http://www.analog.com
Fax: [phone]	© Analog Devices, Inc., 1998

AD6630–SPECIFICATIONS

NORMAL OPERATING CONDITIONS

Parameter (Conditions)	Min	Typ	Max	Units
SINGLE SUPPLY VOLTAGE	8.5		10.5	V
POSITIVE SUPPLY VOLTAGE	4.25	5.0	5.25	V
NEGATIVE SUPPLY VOLTAGE	–5.25	–5.0	–4.25	V
AMBIENT TEMPERATURE	–40		+85	°C
PACKAGE THERMAL RESISTANCE		80		°C/W
OPERATING FREQUENCY1	70		250	MHz

(TMIN = –408C, TMAX = +858C. Output dc levels are nominally at VM, where VM = VCC + VEE = [+5 V + (–5 V)] = 0.

DC SPECIFICATIONS Inputs should be AC coupled.)

		Test
Parameter	Temp	Level	Min	Typ	Max	Units
SUPPLY CURRENT	Full	II		30	48	mA
OUTPUT DC LEVEL	Full	II	VM–150		VM+150	mV

(TMIN = –408C, TMAX = +858C. All AC production tests are performed at 5 MHz. 70 MHz and 250 MHz
AC SPECIFICATIONS performance limits are correlated to 5 MHz testing based on characterization data.)
Parameter1		Test
	Temp	Level	Min	Typ	Max	Units
GAIN (POWER) @ 70 MHz	Full	II	23	24	25	dB
GAIN (POWER) @ 250 MHz	Full	II	22	23	24	dB
–3 dB BANDWIDTH	+25°C	V		700		MHz
OUTPUT REFERRED IP3 @ 70 MHz2	Full	V		22		dBm
OUTPUT REFERRED IP3 @ 250 MHz2	Full	V		19		dBm
OUTPUT REFERRED IP2 @ 70 MHz2	Full	V		45		dBm
OUTPUT REFERRED IP2 @ 250 MHz2	Full	V		45		dBm
OUTPUT REFERRED 1 dB COMPRESSION POINT
@ 70 MHz LOW LEVEL CLAMP3	Full	II	8.5			dBm
OUTPUT REFERRED 1 dB COMPRESSION POINT
@ 250 MHz LOW LEVEL CLAMP3	Full	II	7.5			dBm
OUTPUT REFERRED 1 dB COMPRESSION POINT
@ 70 MHz HIGH LEVEL CLAMP4	Full	II	11			dBm
OUTPUT REFERRED 1 dB COMPRESSION POINT
@ 250 MHz HIGH LEVEL CLAMP4	Full	II	9			dBm
OUTPUT SLEW RATE	+25°C	V		3700		V/µs
INPUT IMPEDANCE (REAL)	+25°C	V		200		Ω
INPUT CAPACITANCE	+25°C	V		2		pF
OUTPUT IMPEDANCE (REAL)	+25°C	V		400		Ω
OUTPUT CAPACITANCE	+25°C	V		2		pF
NOISE FIGURE	+25°C	V		4		dB
LOW LEVEL CLAMP MAXIMUM OUTPUT @ 70 MHz3, 5	Full	IV		11	12.5	dBm
HIGH LEVEL CLAMP MAXIMUM OUTPUT @ 70 MHz4, 5	Full	IV		13.8	14.3	dBm
LOW LEVEL CLAMP MAXIMUM OUTPUT @ 250 MHz3, 5	Full	IV		9.25	10.6	dBm

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AD6630

		Test
Parameter	Temp	Level	Min	Typ	Max	Units
HIGH LEVEL CLAMP MAXIMUM OUTPUT @ 250 MHz4, 5	Full	IV		11.2	12.2	dBm
PHASE VARIATION6	+25°C	V		9		Degree
CMRR7	+25°C	V		50		dB
PSRR8	+25°C	V		30		dB

NOTES

1All specifications are valid across the operating frequency range when the source and load impedance are a conjugate match to the amplifier’s input and output impedance.

2Test is for two tones separated by 1 MHz for IFs at 70 MHz and 250 MHz at –23 dBm per tone input.

3Low Level Clamp is selected by connecting pin CLLO to the negative supply, while pin CLHI is left floating. Clamping can be set at lower levels by connecting pin CLLO and CLHI to the negative supply through an external resistor.

4High Level Clamp is selected by connecting pin CLHI to the negative supply, while pin CLLO is left floating, this allows the maximum linear range of the device to be utilized.

5Output clamp levels are measured for hard clamping with a +3 dBm input level. Valid for a maximum input level of +8 dBm/200 Ω = 3.2 V p-p—differential. 6Measured as the change in output phase when the input level is changed from –53 dBm to +8 dBm (i.e., from linear operation to clamping).

7Ratio of the differential output signal (referenced to the input) to the common-mode input signal presented to all input pins. 8Ratio of signal on supply to differential output (<500 kHz).

Specifications subject to change without notice.

	ABSOLUTE MAXIMUM RATINGS				EXPLANATION OF TEST LEVELS
					I.	100% production tested.
	Parameter	Min	Max	Units
					II.	100% production tested at +25°C, and guaranteed by
	Single Supply Voltage	–0.5	11.5	V
						design and analysis at temperature extremes.
	Positive Supply Voltage	–0.5	5.75	V	III. Sample tested only.
	Negative Supply Voltage	–5.75	0.5	V
					IV. Parameter guaranteed by design and analysis.
	Input Power		+8	dBm
	Storage Temperature	–65	+150	°C	V.	Parameter is typical value only.
	Junction Temperature		+150	°C	VI.	100% production tested at +25°C, and sample tested at
	ESD Protection	1		kV
						temperature extremes.

ORDERING GUIDE

Model	Temperature Range	Package Description	Package Option
AD6630AR	–40°C to +85°C (Ambient)	16-Lead Wide Body SOIC	R-16
AD6630AR-REEL	–40°C to +85°C (Ambient)	AD6630AR on 1000 PC Reel
AD6630R/PCB		Evaluation Board with AD6630AR

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD6630 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

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