AD6458 Просмотр технического описания (PDF) - Analog Devices
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AD6458 Datasheet PDF : 12 Pages
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ABSOLUTE MAXIMUM RATINGS1
Supply Voltage VPS1, VPS2 to COM1, COM2 . . . . . +3.6 V
Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . . 600 mW
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering (60 sec) . . . . . . . . . . . +300°C
NOTES
1Stresses 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 rating conditions for extended periods may affect device
reliability.
2Thermal Characteristics: 20-Lead SSOP Package: θJA = 126°C/W.
ORDERING GUIDE
Model
Temperature Package
Range
Description
Package
Option
AD6458ARS –40°C to +85°C 20-Lead Shrink Small Outline RS-20
AD6458
PIN CONNECTION
20-Lead SSOP (RS-20)
FREF 1
20 VPS1
COM1 2
19 FLTR
PRUP 3
18 VPS2
LOIP 4
17 IRXP
RFLO 5 AD6458 16 IRXN
RFHI
6
TOP VIEW
(Not to Scale)
15
QRXP
COM2 7
14 QRXN
GREF 8
13 GAIN
MXOP 9
12 IFIM
NC 10
11 IFIP
NC = NO CONNECT
PIN FUNCTION DESCRIPTIONS
Pin
Pin
Number Label Description
Function
1
FREF Frequency Reference Input Demodulation LO Input. May be 3 V CMOS input or >100 mV ac coupled for
lowest stand by current.
2
COM1 Common 1
Ground.
3
PRUP Power-Up Input
CMOS compatible power up control; 0 = OFF, 3 V = ON.
4
LOIP Local Oscillator Input
AC coupled LO input. Only 50 mV drive needed, 500 mV max.
5
RFLO RF “Low” Input
Usually connected to ac ground.
6
RFHI RF “High” Input
AC coupled, –109 dBV to –29 dBV RF input from 1 kΩ filter for optimal operation.
7
COM2 Common 2
Ground.
8
GREF Gain Reference Input
High impedance input, sets gain scaling, typically 1.2 V.
9
MXOP Mixer Output
Output of the Mixer.
10
NC
Not internally connected. Should be grounded.
11
IFIP IF Input “Plus”
Differential Input of variable gain amplifier.
12
IFIM IF Input “Minus”
Differential Input of variable gain amplifier.
13
GAIN Gain Control Input
0.2 V–2.4 V using 3 V supply. Max gain at 0.2 V.
14
QRXN Q Output “Negative”
Differential Q Output.
15
QRXP Q Output “Positive”
Differential Q Output.
16
IRXN I Output “Negative”
Differential I Output.
17
IRXP I Output “Positive”
Differential I Output.
18
VPS2 VPOS Supply 2
Supply Voltage.
19
FLTR PPL Loop Filter
Series RC loop filter, connected to VPS2.
20
VPS1 VPOS Supply 1
Supply Voltage.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD6458 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.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
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