AD608AR-REEL7

AD608AR-REEL7 Datasheet

Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608

Part	Datasheet
AD608AR-REEL7	AD608AR-REEL7 (pdf)

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Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608 Mixer −15 dBm, 1 dB compression point −5 dBm IP3 24 dB conversion gain >500 MHz input bandwidth Logarithmic/limiting amplifier 80 dB RSSI range ±3° phase stability over 80 dB range Low power 21 mW at 3 V power consumption CMOS-compatible power-down to 300 uW typical 200 ns enable/disable time PHS, GSM, TDMA, FM, or PM receivers Battery-powered instrumentation Base station RSSI measurements The AD608 provides a low power, low distortion, low noise mixer as well as a complete, monolithic logarithmic/limiting amplifier that uses a successive-detection technique. In addition, the AD608 provides both a high speed received signal strength indicator RSSI output with 80 dB dynamic range and a hard-limited output. The RSSI output is from a two-pole postdemodulation low-pass filter and provides a loadable output voltage of V to V. The AD608 operates from a single V to V supply at a typical power level of 21 mW at 3 V. The RF and local oscillator LO bandwidths both exceed 500 MHz. In a typical IF application, the AD608 can accept the output of a 240 MHz surface acoustic wave SAW filter and downconvert it to a nominal MHz IF with a conversion gain of 24 dB ZIF = 165 The AD608 logarithmic/limiting amplifier section handles any IF from low frequency LF up to 30 MHz. The nominal logarithmic scaling is such that the output is V for a sinusoidal input to the IF amplifier of −75 dBm and V at an input of +5 dBm over this range, the logarithmic conformance is typically ±1 dB. The logarithmic slope is proportional to the supply voltage. A feedback loop automatically nulls the input offset of the first stage down to the submicrovolt level. The AD608 limiter output provides a hard-limited signal output at 400 mV p-p. The voltage gain of the limiting amplifier to this output is more than 100 dB. Transition times are 11 ns and the phase is stable to within ±3° at MHz for signals from −75 dBm to +5 dBm. The AD608 is enabled by a CMOS logic-level voltage input, with a response time of 200 ns. When disabled, the standby power is reduced to 300 uW within 400 ns. The AD608 is specified for the industrial temperature range of −25°C to +85°C for V to V supplies and −40°C to +85°C for V to V supplies. This device comes in a 16-lead plastic SOIC. 24dB MIXER GAIN FUNCTIONAL BLOCK DIAGRAM 3dB NOMINAL INSERTION LOSS 110dB LIMITER GAIN 90dB RSSI 07886-001 RFHI 5 RF INPUT TO RFLO 6 ±6mA MAX OUTPUT ±890mV INTO MIXER LO PREAMP MXOP 7 BPF DRIVER VMID 8 MIDSUPPLY IF BIAS BIAS IF INPUT TO +15dBm2 10.7MHz BAND-PASS FILTER IFHI 9 100nF 10nF 10 IFLO 18nF 13 FDBK VPS1 COM1 LOHI COM2 PRUP 2.7V TO 5.5V LO INPUT and TMIN to TMAX Parameter, Table 1 3 Added Typical Performance Characteristics Heading 6 Added Test Circuits Heading 8 Changes to Figure 17 and Figure 8 Change to Figure 22 9 Changes to Table 9 Updated Outline Dimensions 13 Changes to Ordering Guide 13 Mixer Gain IF Filter Terminations 10 The Logarithmic IF Amplifier 10 Offset Feedback Loop 10 RSSI Output 11 Digitizing the RSSI 11 Power Consumption 11 Applications Information 12 Outline Dimensions 13 Ordering Guide 13 SPECIFICATIONS TA = 25°C, supply = 3 V, dBm is referred to 50 Ω, unless otherwise noted. Table Parameter MIXER PERFORMANCE RF and LO Frequency Range LO Power Conversion Gain Noise Figure 1 dB Compression Point Third-Order Intercept Input Resistance Input Capacitance LIMITER PERFORMANCE Gain Limiting Threshold Input Resistance Input Capacitance Phase Variation DC Level Output Level Rise and Fall Times Output Impedance RSSI PERFORMANCE Nominal Slope Nominal Intercept Minimum RSSI Voltage Maximum RSSI Voltage RSSI Voltage Intercept Logarithmic Linearity Error RSSI Response Time Output Impedance POWER-DOWN INTERFACE Logic Threshold Input Current Power-Up Response Time Power-Down Response Time Power-Down Current POWER SUPPLY Operating Range Powered Up Current OPERATING TEMPERATURE TMIN to TMAX Conditions1 Input terminated in 50 Ω Driving doubly terminated 330 Ω IF filter, ZIF = 165 Ω Matched input, fRF = 100 MHz Matched input, fRF = 240 MHz Input terminated in 50 Ω fRF = 240 MHz and MHz, fLO = MHz fRF = 100 MHz see Table 5 fRF = 100 MHz see Table 5 Full temperature and supply range 3° rms phase jitter at MHz 280 kHz IF bandwidth −75 dBm to +5 dBm IF input signal at MHz Center of output swing VPOS 1 V Limiter output driving 5 kΩ load Driving a 5 pF load At MHz At VPOS = 3 V proportional to VPOS −75 dBm input signal +5 dBm input signal 0 dBm input signal −75 dBm to +5 dBm input signal at IFHI 90% RF to 50% RSSI At midscale System active on logic high For logic high Active limiter output To 200 uA supply current −25°C to +85°C −40°C to +85°C VPOS = 3 V VPOS = V to V VPOS = V to V 1 VPOS is used to refer collectively to the VPS1 and VPS2 pins. AD608 Min Typ Max Unit −16 24 28 −15 −5 −75 Degrees mV p-p 20 mV/dB −85 −25 +85 °C −40 +85 °C AD608 ABSOLUTE MAXIMUM RATINGS Table Parameter Supply Voltages VPS1, VPS2 Internal Power Dissipation Temperature Range Storage Temperature Range Lead Temperature Soldering 60 sec Rating +6 V 600 mW −40°C to +85°C −65°C to +150°C 300°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. ORDERING GUIDE Model Temperature Range AD608AR −40°C to +85°C AD608AR-REEL −40°C to +85°C AD608ARZ1 −40°C to +85°C AD608ARZ-RL1 −40°C to +85°C EVAL-AD608EBZ1 1 Z = RoHS Compliant Part. Package Description 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] Evaluation Board 060606-A AD608 Package Option R-16 R-16 R-16 R-16 AD608 NOTES NOTES AD608 AD608 NOTES Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07886-0-2/09 C

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Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608

Mixer −15 dBm, 1 dB compression point −5 dBm IP3 24 dB conversion gain >500 MHz input bandwidth

Logarithmic/limiting amplifier 80 dB RSSI range ±3° phase stability over 80 dB range

Low power 21 mW at 3 V power consumption CMOS-compatible power-down to 300 uW typical 200 ns enable/disable time

PHS, GSM, TDMA, FM, or PM receivers Battery-powered instrumentation Base station RSSI measurements

The AD608 provides a low power, low distortion, low noise mixer as well as a complete, monolithic logarithmic/limiting amplifier that uses a successive-detection technique. In addition, the AD608 provides both a high speed received signal strength indicator RSSI output with 80 dB dynamic range and a hard-limited output. The RSSI output is from a two-pole postdemodulation low-pass filter and provides a loadable output voltage of V to V. The AD608 operates from a single V to V supply at a typical power level of 21 mW at 3 V.

The RF and local oscillator LO bandwidths both exceed 500 MHz. In a typical IF application, the AD608 can accept the output of a 240 MHz surface acoustic wave SAW filter and downconvert it to a nominal MHz IF with a conversion gain of 24 dB ZIF = 165 The AD608 logarithmic/limiting amplifier section handles any IF from low frequency LF up to 30 MHz.

The nominal logarithmic scaling is such that the output is V for a sinusoidal input to the IF amplifier of −75 dBm and V at an input of +5 dBm over this range, the logarithmic conformance is typically ±1 dB. The logarithmic slope is proportional to the supply voltage. A feedback loop automatically nulls the input offset of the first stage down to the submicrovolt level.

The AD608 limiter output provides a hard-limited signal output at 400 mV p-p. The voltage gain of the limiting amplifier to this output is more than 100 dB. Transition times are 11 ns and the phase is stable to within ±3° at MHz for signals from −75 dBm to +5 dBm.

The AD608 is enabled by a CMOS logic-level voltage input, with a response time of 200 ns. When disabled, the standby power is reduced to 300 uW within 400 ns.

The AD608 is specified for the industrial temperature range of −25°C to +85°C for V to V supplies and −40°C to +85°C for V to V supplies. This device comes in a 16-lead plastic SOIC.
24dB MIXER GAIN

FUNCTIONAL BLOCK DIAGRAM
3dB NOMINAL INSERTION LOSS
110dB LIMITER GAIN 90dB RSSI
07886-001

RFHI 5

RF INPUT TO

RFLO 6
±6mA MAX OUTPUT ±890mV INTO

MIXER

LO PREAMP

MXOP 7

BPF DRIVER

VMID 8

MIDSUPPLY IF BIAS

BIAS

IF INPUT TO
+15dBm2
10.7MHz BAND-PASS

FILTER

IFHI 9
100nF
10nF
10 IFLO
18nF
13 FDBK

VPS1 COM1 LOHI COM2

PRUP
2.7V TO 5.5V

LO INPUT
and TMIN to TMAX Parameter, Table 1 3 Added Typical Performance Characteristics Heading 6 Added Test Circuits Heading 8 Changes to Figure 17 and Figure 8 Change to Figure 22 9 Changes to Table 9 Updated Outline Dimensions 13 Changes to Ordering Guide 13
Mixer Gain IF Filter Terminations 10 The Logarithmic IF Amplifier 10 Offset Feedback Loop 10 RSSI Output 11 Digitizing the RSSI 11 Power Consumption 11 Applications Information 12 Outline Dimensions 13 Ordering Guide 13

SPECIFICATIONS

TA = 25°C, supply = 3 V, dBm is referred to 50 Ω, unless otherwise noted.

Table Parameter MIXER PERFORMANCE

RF and LO Frequency Range LO Power Conversion Gain Noise Figure
1 dB Compression Point Third-Order Intercept Input Resistance Input Capacitance LIMITER PERFORMANCE Gain Limiting Threshold

Input Resistance Input Capacitance Phase Variation DC Level Output Level Rise and Fall Times Output Impedance RSSI PERFORMANCE Nominal Slope Nominal Intercept Minimum RSSI Voltage Maximum RSSI Voltage RSSI Voltage Intercept Logarithmic Linearity Error RSSI Response Time Output Impedance POWER-DOWN INTERFACE Logic Threshold Input Current Power-Up Response Time Power-Down Response Time Power-Down Current POWER SUPPLY Operating Range

Powered Up Current OPERATING TEMPERATURE

TMIN to TMAX

Conditions1

Input terminated in 50 Ω Driving doubly terminated 330 Ω IF filter, ZIF = 165 Ω Matched input, fRF = 100 MHz Matched input, fRF = 240 MHz Input terminated in 50 Ω fRF = 240 MHz and MHz, fLO = MHz fRF = 100 MHz see Table 5 fRF = 100 MHz see Table 5

Full temperature and supply range 3° rms phase jitter at MHz 280 kHz IF bandwidth
−75 dBm to +5 dBm IF input signal at MHz Center of output swing VPOS 1 V Limiter output driving 5 kΩ load Driving a 5 pF load

At MHz At VPOS = 3 V proportional to VPOS
−75 dBm input signal +5 dBm input signal 0 dBm input signal −75 dBm to +5 dBm input signal at IFHI 90% RF to 50% RSSI At midscale

System active on logic high For logic high Active limiter output To 200 uA supply current
−25°C to +85°C −40°C to +85°C VPOS = 3 V

VPOS = V to V VPOS = V to V
1 VPOS is used to refer collectively to the VPS1 and VPS2 pins.

AD608

Min Typ Max Unit
−16
24 28
−15
−5
−75

Degrees
mV p-p
20 mV/dB
−85
−25
+85 °C
−40
+85 °C

AD608

ABSOLUTE MAXIMUM RATINGS

Table Parameter Supply Voltages VPS1, VPS2 Internal Power Dissipation Temperature Range Storage Temperature Range Lead Temperature Soldering 60 sec

Rating +6 V 600 mW −40°C to +85°C −65°C to +150°C 300°C

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

THERMAL RESISTANCE
is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
ORDERING GUIDE

Model

Temperature Range

AD608AR
−40°C to +85°C

AD608AR-REEL
−40°C to +85°C

AD608ARZ1
−40°C to +85°C

AD608ARZ-RL1
−40°C to +85°C

EVAL-AD608EBZ1
1 Z = RoHS Compliant Part.

Package Description 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] 16-Lead Standard Small Outline Package [SOIC_N] Evaluation Board
060606-A

AD608

Package Option R-16 R-16 R-16 R-16

AD608 NOTES

NOTES

AD608

AD608 NOTES

Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

D07886-0-2/09 C

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AD608AR-REEL7 Datasheet file may be downloaded here without warranties.

Datasheet ID: AD608AR-REEL7 517719