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PDF AD6600 Data sheet ( Hoja de datos )
| Número de pieza | AD6600 | |
| Descripción | Dual Channel/ Gain-Ranging ADC with RSSI | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Dual Channel, Gain-Ranging
ADC with RSSI
AD6600
FEATURES
Dual IF Inputs, 70 MHz–250 MHz
Diversity or Two Independent IF Signals
Separate Attenuation Paths
Oversample RF Channels
20 MSPS on a Single Carrier
10 MSPS/Channel in Diversity Mode
Total Signal Range 90+ dB
30 dB from Automatic Gain-Ranging (AGC)
60 dB from A/D Converter
Range >100 dB After Processing Gain
Digital Outputs
11-Bit ADC Word
3-Bit RSSI Word
2؋ Clock, A/B Indicator
Single 5 V Power Supply
Output DVCC 3.3 V or 5 V
775 mW Power Dissipation
APPLICATIONS
Communications Receivers
PCS/Cellular Base Stations
GSM, CDMA, TDMA
Wireless Local Loop, Fixed Access
PRODUCT DESCRIPTION
The AD6600 mixed-signal receiver chip directly samples signals
at analog input frequencies up to 250 MHz. The device includes
two input channels, each with 1 GHz input amplifiers and
30 dB of automatic gain-ranging circuitry. Both channels are
sampled with a 450 MHz track-and-hold followed by an 11-bit,
20 MSPS analog-to-digital converter. Digital RSSI outputs, an
A/B channel indicator, a 2× Clock output, references, and con-
trol circuitry are all on-chip. Digital output signals are two’s
complement, CMOS-compatible and interface directly to
3.3 V or 5 V digital processing chips.
The primary use for the dual analog input structure is sampling
both antennas in a two-antenna diversity receiver. However,
Channels A and B may also be used to sample two independent
IF signals. Diversity, or dual-channel mode, is limited to 10 MSPS
per channel. In single-channel mode, the full clock rate of
20 MSPS may be applied to a single carrier.
The AD6600 may be used as a stand-alone sampling chip, or it
may be combined with the AD6620 Digital Receive Signal Pro-
cessor. The AD6620 provides 10 dB–25 dB of additional pro-
cessing gain before passing data to a fixed- or floating-point DSP.
Driving the AD6600 is simplified by using the AD6630 differen-
tial IF amplifier. The AD6630 is easily matched to inexpensive
SAW filters from 70 MHz to 250 MHz.
Designed specifically for cellular/PCS receivers, the AD6600
supports GSM, IS-136, CDMA and Wireless LANs, as well as
proprietary air interfaces used in WLL/fixed-access systems.
Units are available in plastic, surface-mount packages (44-lead
LQFP) and specified over the industrial temperature range
(–40°C to +85°C).
FUNCTIONAL BLOCK DIAGRAM
NOISE FILTER
0dB, –12dB, –24dB
AIN
ATTEN
AIN
DETECT SET
PEAK RSSI
GAIN
3
RSSI
GAIN
BIN
ATTEN
BIN
0dB, –12dB, –24dB
FLT FLT
630⍀
RESONANT
PORT
+12, +18dB
GAIN
SELECT GAIN
ENCODE
TWO'S
A/D COMPLEMENT
CONVERTER
11
ENCODE
3
RSSI
AB_OUT
D10–D0
RSSI [2:0]
AD6600
TIMING
CLK2؋
REV. 0
A_SEL B_SEL
AVCC GND
ENC ENC
DVCC
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: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
AD6600
AC SPECIFICATIONS (AVCC = 5 V, DVCC = 3.3 V; ENC and ENC = 20 MSPS, Duty Cycle = 50%; TMIN = –40؇C, TMAX = +85؇C unless
otherwise noted.)
Parameter
ANALOG INPUTS1
Analog Input 3 dB Bandwidth2
Differential Analog Input Voltage Range
70 MHz
150 MHz
200 MHz
250 MHz
Differential Analog Input Impedance3
70 MHz
150 MHz
200 MHz
250 MHz
300 MHz
350 MHz
400 MHz
450 MHz
Full-Scale Input Power
70 MHz
150 MHz
200 MHz
250 MHz
Full-Scale Gain Tolerance4
70 MHz–250 MHz
200 MHz5
Gain Error
AIN = 200 MHz
@ –76 dBFS
Gain Matching (Input A:B)
70 MHz–250 MHz
200 MHz
Range-to-Range Gain Tolerance
70 MHz–250 MHz
Range-to-Range Phase Tolerance
70 MHz
250 MHz
Channel Isolation6
70 MHz–250 MHz
Noise7
Minimum Attenuation Level
Maximum Attenuation Level
Attenuator 3OIP8
Signal-to-Noise Ratio (SNR)9, 10, 11
AIN = 70 MHz
@ –1 dBFS
@ –6 dBFS
@ –10 dBFS
@ –12 dBFS to –42 dBFS
@ –54 dBFS
AIN = 150 MHz
@ –1 dBFS
@ –6 dBFS
@ –10 dBFS
@ –12 dBFS to –42 dBFS
@ –54 dBFS
Temp
Full
Full
Full
Full
Full
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Full
Full
Full
Full
Full
25°C
25°C
Full
Full
Full
Full
Full
Full
Full
Full
Full
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Test
Level
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
I
I
V
II
V
V
V
IV
V
V
V
IV
V
IV
IV
IV
IV
V
IV
IV
IV
AD6600AST
Min Typ
450
2.45
2.57
2.62
2.86
197–j24
188–j48
175–j57
161–j67
151–j73
140–j80
141–j75
173–j107
5.8
6.3
6.7
7.7
± 0.5
–1.0 ± 0.1
Max
+1.0
–1.5
± 0.1
–0.5 ± 0.05
± 0.1
0.2
0.5
45 50
34
869
+33
+1.5
+0.5
55 59
54.5
45 49
41 48 ± 6
31 34
55 58
54
45 49
41 48 ± 6
31 34
Unit
MHz
V p-p
V p-p
V p-p
V p-p
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
dBm
dBm
dBm
dBm
dB
dB
dB
dB
dB
dB
Degree
Degree
dB
µV rms
µV rms
dBm
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
REV. 0
–5–
5 Page 
RSSI Gain Step
The input amplitude span between taps of the RSSI (received
signal strength) attenuator ladder. Ideally each stage should
span 6 dB of input power.
RSSI Hysteresis
The amount of movement in the RSSI switch points, depending
on the direction of approach. Hysteresis prevents unnecessary
RSSI toggling when input signal power is near a threshold.
Signal-to-Noise Ratio (Without Harmonics)
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral compo-
nents, excluding the first five harmonics and dc.
Worst Other Spur
The ratio of the rms signal amplitude to the rms value of the
worst spurious component (excluding the second and third
harmonic) reported in dBc.
AD6600 TRANSFER FUNCTION
AD6600
60
54
48
42
36
30
24
18
12
6
0
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
AIN LEVEL – dBFS
Figure 1. SNR vs. Input Power
0
REV. 0
–11–
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD6600.PDF ] | |
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