ADF7021-VBCPZ-RL Analog Devices Inc, ADF7021-VBCPZ-RL Datasheet - Page 3

• Manufacturer Part Number: ADF7021-VBCPZ-RL
• Description: Narrow Band Transceiver 433/868/900 MHz
• Manufacturer: Analog Devices Inc

Specifications of ADF7021-VBCPZ-RL

• Frequency: 80MHz ~ 960MHz
• Data Rate - Maximum: 24 kbps
• Modulation Or Protocol: FSK
• Applications: ISM
• Power - Output: 13dBm
• Sensitivity: -125dBm
• Voltage - Supply: 2.3 V ~ 3.6 V
• Current - Receiving: 21.7mA
• Current - Transmitting: 27.1mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

GENERAL DESCRIPTION
The ADF7021-V is a high performance, low power, narrow-band
RF transceiver based on the ADF7021-N. The architecture of
the ADF7021-V transceiver is similar to that of the ADF7021-N
except that an external VCO is used by the on-chip RF synthesizer
for applications that require improved phase noise performance.
The ADF7021-V is designed to operate in both the license-free
ISM bands and in the licensed bands from 80 MHz to 960 MHz.
To minimize RF feedthrough and spurious emissions, the
external VCO operates at 2× or 4× the desired RF frequency;
the ADF7021-V supports a maximum VCO frequency operation
of 1920 MHz. The 4× VCO operation is programmable by
enabling an additional on-chip divide-by-2 outside the RF
synthesizer loop and offers improved phase noise performance.
As with the ADF7021-N receiver, the IF filter bandwidths
of 9 kHz, 13.5 kHz, and 18.5 kHz are supported, making the
ADF7021-V ideally suited to worldwide narrow-band telemetry
applications.
The part has both Gaussian and raised cosine transmit data
filtering options to improve spectral efficiency for narrow-band
applications. It is suitable for circuit applications targeted at the
following:
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A complete transceiver can be built using a small number of
discrete external components, making the ADF7021-V very
suitable for area-sensitive, high performance driven applications.
The range of on-chip FSK modulation and data filtering options
allows users greater flexibility in their choice of modulation
schemes while meeting the tight spectral efficiency requirements.
The ADF7021-V also supports protocols that dynamically switch
among 2FSK, 3FSK, and 4FSK to maximize communication
range and data throughput.
European ETSI EN 300 220
North American FCC Part 15, Part 90, and Part 95
Japanese ARIB STD-T67
Korean short-range device regulations
Chinese short-range device regulations
Rev. 0 | Page 3 of 60
The transmit section contains a low noise fractional-N PLL with
an output resolution of <1 ppm. The frequency-agile PLL allows
the ADF7021-V to be used in frequency-hopping spread spectrum
(FHSS) systems. The VCO is external, which provides better
phase noise and thus lower adjacent channel power (ACP) and
adjacent channel rejection (ACR) compared with the ADF7021-N.
The VCO tuning range extends from 0.2 V to 2 V, which should
be taken into account when choosing the external VCO.
The transmitter output power is programmable in 63 steps from
−16 dBm to +13 dBm and has an automatic power amplifier ramp
control to prevent spectral splatter and help meet regulatory
standards. The transceiver RF frequency, channel spacing, and
modulation are programmable using a simple 3-wire interface.
The device operates with a power supply range of 2.3 V to 3.6 V
and can be powered down when not in use.
A low IF architecture is used in the receiver (100 kHz), which
minimizes power consumption and the external component
count yet avoids dc offset and flicker noise at low frequencies.
The IF filter has programmable bandwidths of 9 kHz, 13.5 kHz,
and 18.5 kHz. The ADF7021-V supports a wide variety of pro-
grammable features, including Rx linearity, sensitivity, and IF
bandwidth, allowing the user to trade off receiver sensitivity
and selectivity against current consumption, depending on
the application. The receiver also features a patented automatic
frequency control (AFC) loop with programmable pull-in range
that allows the PLL to remove the frequency error in the
incoming signal.
The receiver achieves an image rejection performance of 50 dB
using a patent-pending IR calibration scheme that does not
require the use of an external RF source.
An on-chip ADC provides readback of the integrated temper-
ature sensor, external analog input, battery voltage, and RSSI
signal, which can eliminate the need for an external ADC in
some applications. The temperature sensor is accurate to ±10°C
over the full operating temperature range of −40°C to +85°C.
This accuracy can be improved by performing a one-point cali-
bration at room temperature and storing the result in memory.
ADF7021-V