DataSheet8.cn


PDF ( 数据手册 , 数据表 ) AD6458

零件编号 AD6458
描述 GSM 3 V Receiver IF Subsystem
制造商 Analog Devices
LOGO Analog Devices LOGO 


1 Page

No Preview Available !

AD6458 数据手册, 描述, 功能
a
FEATURES
Fully Compliant with Standard and Enhanced GSM
Specification
–12 dBm Input 1 dB Compression Point
–2 dBm Input Third Order Intercept
10 dB SSB Noise Figure (330 )
DC–400 MHz RF and LO Bandwidths
Linear IF Amplifier
Linear-in-dB and Stable over Temperature Voltage
Gain Control
Quadrature Demodulator
Onboard Phase-Locked Quadrature Oscillator
Demodulates IFs from 5 MHz to 50 MHz
Low Power
9 mA at Midgain
1 A Sleep Mode Operation
3.0 V to 3.6 V Operation
Interfaces to AD7013, AD7015 and AD6421 Baseband
Converters
20-Lead SSOP
GSM 3 V Receiver IF Subsystem
AD6458
FUNCTIONAL BLOCK DIAGRAM
LO
RF
AGC
FREF
BPF
PLO
I
Q
AD6458
GENERAL DESCRIPTION
The AD6458 is a 3 V, low power receiver IF subsystem for
operation at input frequencies as high as 400 MHz and IFs from
5 MHz up to 50 MHz. It is optimized for operation in GSM,
DCS1800 and PCS1900 receivers. It consists of a mixer, IF
amplifier, I and Q demodulators, a phase-locked quadrature
oscillator, precise AGC subsystem, and a biasing system with
external power-down.
The low noise, high intercept mixer of the AD6458 is a
doubly-balanced Gilbert cell type. It has a nominal –12 dBm
input-referred 1 dB compression point and a –2 dBm input-
referred third-order intercept. The mixer section of the AD6458
also includes a local oscillator (LO) preamplifier, which lowers
the required LO drive to –16 dBm.
The gain control input accepts an external gain-control voltage
input from an external AGC detector or a DAC. It provides an
80 dB gain range with 27 mV/dB gain scaling.
The I and Q demodulators provide inphase and quadrature
baseband outputs to interface with Analog Devices’ AD7013
(IS54, TETRA, MSAT) and AD7015 and AD6421 (GSM,
DCS1800, PCS1900) baseband converters. An onboard
quadrature VCO which is externally phase-locked to the IF
signal drives the I and Q demodulators. This locked reference
signal is normally provided by an external VCTCXO under the
control of the radio’s digital processor. The AD6458 can also
provide demodulation of N-PSK and N-QAM in many non-
TDMA systems when used with external analog carrier recovery
systems such as the Costas Loop. Finally, the VCO can be
phase-locked to a frequency which is deliberately offset from the
IF, as in the case of a Beat-Frequency Oscillator (BFO), result-
ing in the product detection of CW or SSB.
The AD6458 uses supply voltages from 3.0 V to 3.6 V over the
temperature range of –40°C to +85°C. Operation is enabled by
a CMOS logical level; response time is typically <80 µs. When
disabled, the standby current is reduced to 1 µA.
The AD6458 comes in a 20-lead shrink small outline (SSOP)
surface-mount package.
REV. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997







AD6458 pdf, 数据表
AD6458
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10 15 20 25 30 35 40 45 50 55
FREF FREQUENCY – MHz
Figure 17. Demodulator Quadrature Error vs. FREF
Frequency, TA = +25 °C, VPOS = 3.0 V
–0.1
–0.3
–0.5
–0.7
–0.9
–1.1
–1.3
–1.5
5
10 15 20 25 30 35 40 45 50 55
PLL FREQUENCY – MHz
Figure 20. PLL Loop Voltage at FLTR Pin (kVCO) vs. Frequency
16
= 2.1d°
14 = 0.3d°
12
10
8
6
4
2
0
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
ERROR – Degrees
Figure 18. Demodulator Quadrature Error Histogram
TA = +25°C, VPOS = 3.0 V. FIF = 13 MHz
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
0
0.5 1.0 1.5 2.0 2.5
VGAIN – Volts
Figure 21. System [(Mixer + IF Ceramic Filter + IF Ampli-
fier + Demodulator)] Input 1 dB Compression Point vs.
VGAIN, TA = +25°C, VPOS = 3.0 V, FIF = 13 MHz, FRF = 83 MHz,
VREF = 1.2 V
–90
–95
–100
–105
–110
–115
–120
0.1
1 10 100 1k
CARRIER FREQUENCY – kHz
10k
Figure 19. PLL Phase Noise vs. Frequency, VPOS = 3 V,
CFLTR = 1 nF, RFLTR = 1 k, FREF = 13 MHz
80
70
60
50
40
30
20
10
0
–10
–20
0
0.5 1.0 1.5 2.0 2.5
VGAIN – Volts
Figure 22. System (Mixer + IF Ceramic Filter + IF Amplifier
+ Demodulator) Conversion Gain vs. VGAIN, TA = +25°C,
VPOS = 3.0 V, FIF = 13 MHz, FRF = 83 MHz, VREF = 1.2 V
–8– REV. 0














页数 12 页
下载[ AD6458.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
AD645Low Noise/ Low Drift FET Op AmpAnalog Devices
Analog Devices
AD6458GSM 3 V Receiver IF SubsystemAnalog Devices
Analog Devices
AD6459GSM 3 V Receiver IF SubsystemAnalog Devices
Analog Devices

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap