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AD6190ARS-AD6190ARSRL
900 MHz RF Transceiver
REV.0
900 MHz RF Transceiver
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Complete 900 MHz RF Transceiver
LNA
Receive Mixer
Transmit Mixer
Driver Amplifier
VCO
Prescaler
Limiter Amplifier with RSSI
On-Chip Low Dropout Regulator
Independent Sleep Modes for TX, RX
28-Lead SSOP Package
APPLICATIONS
902 MHz–928 MHz ISM Band Cordless Telephones
902 MHz–928 MHz ISM Band Wireless Data Systems
GENERAL DESCRIPTIONThe AD6190 900 MHz RF Transceiver provides a complete
RF/IF section for systems operating in the 902 MHz–928 MHz
license-free ISM band. The high level of integration allows several
dozen discrete components to be replaced. It is ideally suited
for use in cordless telephone and wireless data applications.
The receiver section includes a Low Noise Amplifier (LNA).
The LNA’s output drives an image-reject mixer; the mixer’s
output optimized for 10.7 MHz is filtered and processed by the
limiting IF amplifier.
The transmit section accepts a modulated 10.7 MHz IF input,
and uses an image-reject upconverter to mix the signal up to the
902 MHz–928 MHz RF carrier frequency while suppressing the
unwanted image and LO components. The RF output is raised
to a nominal 0.5 milliwatt (–3 dBm) output level. This output
can be used directly or can drive an external power amplifier to
higher levels.
The on-chip VCO operates at 2× the local oscillator frequency.
This reduces oscillator pulling due to strong interferers in-band
or transmitter leakage. An on-chip 64/65 prescaler allows the
VCO to be controlled by a low cost 15 MHz CMOS synthesizer.
An on-chip low dropout regulator minimizes VCO pushing. The
transmit section, receive section, or both, can be placed in a low
current SLEEP mode when not in use. The AD6190 900 MHz
RF transceiver is packaged in a 28-lead SSOP package.
The AD6190 900 MHz RF Transceiver is part of the Analog
Devices/Zilog “A-to-Z Phone” Spread-Spectrum System for
cordless telephone and data communications applications. Con-
tact Zilog directly at (408) 370-8000 for more information on
the Z87000 series baseband controller chips.
AD6190–SPECIFICATIONS
(@ TA = +258C, VCC = +3.3 V, FIF = 10.7 MHz, FRF = 902 MHz–928 MHz, TX IF Input
level 137 mV p-p, unless otherwise noted)Specifications subject to change without notice.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD6190 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.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage
VBATT, VCCIF, LNAVCC, VCCTX to GND . . . .+5.5 V
Maximum RF Input Level Without Damage . . . . . . .+20 dBm
Internal Power Dissipation2. . . . . . . . . . . . . . . . . . . .500 mW
Operating Temperature Range . . . . . . . . . . .–25°C to +85°C
Storage Temperature Range . . . . . . . . . . . .–65°C to +150°C
Lead Temperature Range
(Soldering, 60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+300°C
ORDERING GUIDEMinimum order quantity 25,000 units.
NOTESStresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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 Characteristics: 28-lead SSOP package θJA = 122°C/W.
Figure 1. Test Circuit
82pF
VCOON
PRESCALER
OUT
TUNE
VOLTAGE IN
RSSI OUT
TRANSMIT
RXON
2.2pF
TXON
VCCTX
(3.3VDC)
VCC DRIVER
(3.3VDC)
TRANSMIT
RF OUT
LIMITER OUT
VCCLNA
(3.3VDC)
LNA IN
VCC MIXER
(3.3VDC)
VCCIF
(3.3VDC)
MODULUS CONTROL
VBATT
(3.0-4.5VDC)
AD6190
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
PREOUT
RFOUT
VCCTX
TXON
PREMOD
VCOON
VBATT
VBASE
GND
LIMOUT
PAGNDTANK2
GND
TANK+
RSSI
TXIF
VREGLNAGND
RFIN
VCCLNA
RXON
LIMIN
IFAMPCOM
IFAMPOUT
LNAGND
IFAMPIN
VCCIF
RXMIXOUT
Figure 2.RSSI Voltage vs. Input Power
Figure 3.RSSI Voltage vs. Input Power
Figure 4.RSSI Error vs. Input Power
Figure 5.Limiter Output Level vs. Temperature @ 3.3 V
and 915 MHz
CENTER 915.0 MHz
#RES BW 10 kHz
VBW 10 kHzSPAN 150.0 MHz
SWP 4.50 sec
#AT 30 dB
MKR 915.0 MHz
0.0 dBmFigure 6.Frequency Spectrum
Figure 7.Prescaler Output
AD6190
PRODUCT DESCRIPTIONThe AD6190 is a complete RF/IF transceiver for operation in
the 902 MHz–928 MHz Industrial, Scientific and Medical
(“ISM”) frequency band. Together with a suitable spread-
spectrum controller, the AD6190 can be used to design
a spread-spectrum system compliant with FCC “Part 15”
(47CFR15.247) regulations. The AD6190 is a fully compatible
companion chip to the Zilog Z87L00 “ZPhone” frequency-
hopping spread-spectrum controller.
The AD6190 includes a receive path of LNA, image-reject
mixer, IF amplifier and limiter amplifier with RSSI. The trans-
mit path accepts a 10.7 MHz IF input signal, and uses image-
reject upconversion to the 902 MHz–928 MHz band. Frequency
control is achieved using an on-chip VCO and dual-modulus
prescaler connected to an inexpensive low frequency PLL for
channel selection and frequency hopping.
Additionally, an on-chip voltage regulator stabilizes the VCO to
prevent LO pushing due to power supply variations.
APPLYING THE AD6190
Receive Signal PathThe AD6190 Low Noise Amplifier (LNA) and image-reject
mixer together provide downconverter with a total gain of 24 dB
and a typical Noise Figure (NF) of 4.2 dB.
The LNA input port exhibits an impedance of 320-j61 at
915 MHz. In order to provide an optimum match to a 50 Ω
source, the network shown in Figure 8 should be used.
Figure 8.LNA Input Matching Circuit
The frequency plan of the AD6190 provides the lowest possible
RF implementation cost. A single conversion design is used with
a 10.7 MHz IF to take advantage of the very low cost filters
available. However, since the 902 MHz–928 MHz band is wider
than twice the IF, it is possible that undesired in-band signals
will be mixed down to the IF. These images could cause inter-
ference to the desired signal. It is thus necessary to provide
tunable filtering before the receive mixer, or some other ap-
proach to eliminate interference from image signals.
In the AD6190, a technique known as “image-reject” (or SSB)
mixing is used. This technique suppresses image interference by
using a pair of mixers with quadrature local oscillators. See
Figure 9.
OUTRFFigure 9.Image-Reject Mixer
The RF signal, containing both the desired signal at (FLO + FIF)
and another possible signal at the image frequency of (FLO – FIF) is
applied to two mixers in parallel. These mixers are driven by
local oscillator signals in quadrature. The mixer outputs at the
two mixer IF ports contain both the desired signal and the
image signal. However, the outputs of the two mixers are in
quadrature (shifted 90 degrees relative to each other). The
outputs of the two mixers are then shifted another 90 degrees
relative to each other in a phase-shift network. The two mixer
outputs thus contain the desired signal and the image signal
exactly 180 degrees out of phase. By adding (or subtracting) the
two signals, the undesired image signals cancel, the desired
signal components add, and image-rejection occurs. Local oscil-
lator leakage is suppressed by the use of doubly-balanced mixers.
The quality of the image rejection is a function of the phase and
amplitude matching of the quadrature branches of the LO and
IF phase-shift networks. In the AD6190, image-rejection is
typically 33 dB.
The mixer output that drives the input side of the first
10.7 MHz filter should also be connected through a parallel
RLC network of 6.8 pF, 1 kΩ, and 7 pF to the power supply to
match the 330 Ω filter impedance.
The 10.7 MHz IF signal is then filtered and amplified by a
24 dB fixed gain. The output of this stage is further filtered, and
applied to a 6-stage limiting amplifier. The limiter output signal
is typically 450 mV p-p into a 30 kΩ, 30 pF load, with a dc
offset level of approximately 1.76 V dc.
All 10.7 MHz IF filters are assumed to be standard 330 Ω imped-
ance ceramic types. The AD6190 RX IF signal chain and TX IF
input includes internal matching resistors for this impedance.
When used with the Zilog Z87L00 Spread-Spectrum Controller
IC, the 10.7 MHz IF signal contains the received data encoded in
FSK modulation with approximately a ±33 kHz deviation. The
Z87L00 performs the FSK demodulation in the digital domain.
The RSSI (Received Signal Strength Indicator) signal represents
the strength of the received signal, linear in dB, and scales with
supply voltage. With a 3.3 V supply (through a 10 Ω resistor on
the VCCIF pin), an RF signal level of –100 dBm at the LNA
input will produce an RSSI voltage of approximately 900 mV.
The RSSI voltage will increase with increasing RF input level,
at approximately 22 mV/dB to approximately 2.4 V at
–30 dBm input. The RSSI output voltage remains above 2.4 V
for input levels up to +15 dBm.
