CXA3556N [SONY]
IF Down Converter for Digital Broadcast; IF下变频器数字广播
| 型号： | CXA3556N |
| 厂家： | 
SONY CORPORATION |
| 描述： | IF Down Converter for Digital Broadcast |
| 文件： | 总13页 (文件大小：144K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CXA3556N
IF Down Converter for Digital Broadcast
Description
24 pin SSOP (Plastic)
The CXA3556N is a one-chip integrated IC that
processes IF signals of a digital broadcast tuner and
includes an AGC amplifier circuit, a mixer circuit, a
local oscillator circuit and an output amplifier circuit.
The package utilizes a 24-pin SSOP suitable for
surface mounting.
Features
• AGC control width that has a 56dB variable range
• Low noise characteristics
Absolute Maximum Rating (Ta = 25°C)
• Supply voltage
Vcc
–0.3 to +12
–55 to +150
V
• Low distortion characteristics (in particular, during
AGC gain reduction)
• Operating temperature Topr
°C
• Includes switching function between down
converter mode and linear amplifier mode
• Variable output amplifier gain by changing external
resistance
Operating Conditions
• Supply voltage
Vcc
4.75 to 5.25
–25 to +75
V
• Operating temperature Topr
°C
• Includes RF AGC output pin
• Variable RF AGC settings
• AGC control curve characteristics with excellent
linearity
Applications
Digital broadcast tuners
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
– 1 –
E02426-PS
CXA3556N
Block Diagram and Pin Configuration
IFIN1
IFIN2
AGCIN
1
2
24
23
22
MODESEL
AGCGND
RFAGC
IREG
Comparator
REG
3
4
21 AO2
20 AO1
19 GND
18 AGCREF
17 E2
VREG
LOB1
LOC1
LOC2
LOB2
5
AGC
Amp.
Output
Amp.
6
7
Mixer
8
OSC
9
16 E1
V
CC
1
10
15 AIN2
14 AIN1
MO1 11
12
13
V
MO2
CC2
– 2 –
CXA3556N
Pin Description and Equivalent Circuit
Pin
No.
Pin
voltage
Symbol
Equivalent circuit
Pin description
V
CC1
10
1
2
IFIN1
1.4V
1.4V
1
2
IF inputs.
5k
5k
IFIN2
22
AGCGND
3
RF AGC voltage output.
Comparator output.
3
RFAGC
—
Low level: 0.4V or less
High level: 8V or more
22
AGCGND
VCC1
10
Connects external resistance
27kΩ.
4
IREG
2.6V
4
22
AGCGND
VCC1
10
Connects external capacitance
1µF.
5
VREG
3.3V
5
22
AGCGND
6
7
8
9
LOB1
LOC1
LOC2
LOB2
2.9V
3.7V
3.7V
2.9V
6
8
7
9
V
CC1
10
Connects external capacitance
and crystal oscillator.
19
GND
– 3 –
CXA3556N
Pin
No.
Pin
voltage
Symbol
Equivalent circuit
Pin description
Power supply.
10
VCC1
5V
V
CC1
10
11 MO1
2.3V
11
12
Mixer output pin.
Power supply.
12 MO2
2.3V
19
GND
13
VCC2
5V
V
CC1
14 AIN1
15 AIN2
16 E1
1.3V
10
200
14
15
Output amplifier circuit inputs.
Gain of output amplifier circuit
can be changed by connecting
external resistance between
Pins 16 and 17.
1.3V
0.6V
0.6V
200
10k
10k
17
19
GND
17 E2
16
18
VCC1
90µA
10
RF AGC setting voltage
adjustment pin.
Connect external resistance
between Pin 18 and GND and
change the value to change
RF AGC output voltage.
18 AGCREF
—
22
AGCGND
19 GND
20 AO1
0V
GND
V
CC1
10
2.7V
20 21
Output amplifier output.
21 AO2
2.7V
19
GND
– 4 –
CXA3556N
Pin
No.
Pin
voltage
Symbol
Equivalent circuit
Pin description
22 AGCGND
0V
AGC circuit GND.
Selects either IF down
converter mode or linear
amplifier mode.
20k
When the voltage applied to
this pin is 0.3V or less, the
mode is down converter mode.
When the voltage is 4.75 to
5.25V, the mode is linear
amplifier mode.
23
22
23 MODESEL
—
GND
VCC1
10
AGC control.
Input voltage range is 0 to 2.2V.
24 AGCIN
—
24
22
AGCGND
– 5 –
CXA3556N
Electrical Characteristics (VCC = 5V, Ta = 25°C)
(1) IF down converter mode (fvco = 49.38MHz)
Item
Current
Symbol
ICCA
Measurement conditions
Input signal = no signal
Min. Typ. Max. Unit
63
mA
dB
44
65
77
73
consumption A
AGC_IN voltage = 0V
Input signal = 1 wave (43.5MHz), AGC_IN voltage = 2.2V
Output signal = 1Vp-p
Gain 1
G1
68.5
Input signal = 1 wave (43.5MHz), AGC_IN voltage = 0V
Output signal = 1Vp-p
Gain 2
G2
12.2
56
dB
dB
10
54
15
58
—
Gain width
IM3_1
G3
G3 = G1 – G2
Input signal = 2 waves (43.5MHz, 43.6MHz)/–26dBm
Output signal = 1Vp-p
DIS1
–51
dBc
–44
Input signal = 2 waves (43.5MHz, 43.6MHz)/–21dBm
Output signal = 1Vp-p
IM3_2
DIS2
–51
–100
–120
dBc
–42
—
—
Input signal = –60dBm (43.5MHz)
Output signal = 1Vp-p
Output noise 1 NF1
Output noise 2 NF2
dBc/Hz
dBc/Hz
–96
–111
Input signal = –20dBm (43.5MHz)
Output signal = 1Vp-p
—
(2) Linear amplifier mode
Item
Current
Symbol
ICCB
Measurement conditions
Input signal = no signal
Min. Typ. Max. Unit
63
mA
dB
44
65
77
73
consumption B
AGC_IN voltage = 0V
Input signal = 1 wave (43.5MHz), AGC_IN voltage = 2.2V
Output signal = 1Vp-p
Gain 4
G4
68.5
Input signal = 1 wave (43.5MHz), AGC_IN voltage = 0V
Output signal = 1Vp-p
Gain 5
G5
12.7
56
dB
dB
10
54
15
58
—
Gain width
IM3_3
G6
G6 = G4 – G5
Input signal = 2 waves (43.5MHz, 43.6MHz)/–26dBm
Output signal = 1Vp-p
DIS3
–51
dBc
–44
Input signal = 2 waves (43.5MHz, 43.6MHz)/–21dBm
Output signal = 1Vp-p
IM3_4
DIS4
–51
–100
–120
dBc
–42
—
—
Input signal = –60dBm (43.5MHz)
Output signal = 1Vp-p
Output noise 3 NF3
Output noise 4 NF4
dBc/Hz
dBc/Hz
–96
–111
Input signal = –20dBm (43.5MHz)
Output signal = 1Vp-p
—
(3) Output amplifier characteristics
Item
characteristics
Symbol
F
Measurement conditions
Input signal = 60MHz
Short between Pins 16 and 17
Min. Typ. Max. Unit
–3 –1.5 dB
F
0
– 6 –
CXA3556N
Measurement circuit 1
IF down converter mode
3
AGCIN
0 to 2.2V
Output
5V (ICC2)
1µ
51
51
470
470
R
1k
680
10n
10n
1n
51p 51p
24
23
22
21
20
19
18
17
16
15
14
13
6.8µH
6.8µH
51p 51p
300
10n
300
10n
1
2
3
4
5
6
7
8
9
10
11
100p
12
1n
1n
1n
27k
2p
10p
2p
1n
47k
1µ
200
1µH
100p
49.38MHz
1
2
27p
27p
1µ
1
Toko 617DB-1018
3rd overtone crystal oscillator (49.381MHz)
2
3
I
CCA = ICC1 + ICC2
SG input
9V
5V (ICC1)
3
– 7 –
CXA3556N
Measurement circuit 2
Linear mode
4
AGCIN
Output
0 to 2.2V 5V (ICC1)
5V (ICC2)
1µ
1n
51
51
470
470
R
680
1n
1n
24
23
22
21
20
19
18
17
16
15
14
13
300
300
1n
1
2
3
4
5
6
7
8
9
10
11
100p
12
1n
1n
1n
27k
1n
1n
47k
1µ
200
1k
2k
2k
5V
100p
1µ
4 ICCB = ICC1 + ICC
2
SG input
9V
5V (ICC1)
4
– 8 –
CXA3556N
Measurement circuit 3
Output amplifier F characteristics
AGCIN
0 to 2.2V 5V (ICC2)
Output
IF input 5V (ICC2)
1µ
51
51
1
470
470
50k
200
1n
1n
1n
1n
1n
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
100p
12
27k
1n
47k
1n
1n
1µ
1n
1k
2k
2k
5V
100p
1µ
9V
5V (ICC1)
– 9 –
CXA3556N
Application circuit
IF down converter mode
AGCIN
0 to 2.2V
VCC
Output
1µ
27k
10k
1k
1k
680
10n
10n
1µ
47p 47p
24
23
22
21
20
19
18
17
16
15
14
13
6.8µH
6.8µH
47p 47p
330
10n
330
10n
1
2
3
4
5
6
7
8
9
10
11
12
27k
2p
10p
1µH
2p
1n
1n
1n
1µ
1n
IF input
47k
1µ
49.38MHz
27p
27p
2
1µ
RFAGC 9V
VCC
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
– 10 –
CXA3556N
Description of Functions
The CXA3556N is an IF down converter IC for digital broadcasts. This IC contains a mixer circuit, a local
oscillator circuit and an AGC circuit that standardizes IF signals in response to levels of input signals.
It can also operate in a mode other than down converter (linear amplifier mode) and making possible use in a
wide variety of digital broadcast tuners. (Control using Pin 23 bias voltage.)
1. AGC Circuit
This is a variable gain amplifier circuit that standardizes output in response to levels of input signals. This
circuit has especially excellent low distortion and noise characteristics even when the input level is large. It
also has a variable width of 56dB as the gain control range with excellent linearity of the gain control curve.
2. Local Oscillator Circuit
This circuit has a structure that uses a crystal oscillator and oscillates at 3rd overtone frequency. The circuit
sets the parallel frequency of the parallel LC resonator between Pins 7 and 8 close to a tertiary overtone
frequency (FVCO). This oscillator circuit can also use an LC resonance circuit in place of the crystal oscillator
to form an oscillator circuit.
3. Output Amplifier Circuit
Adding a resistor between Pins 16 and 17 allows the gain to be changed in proportion to that resistance.
(Refer to characteristic graph Fig. 5 Gain vs. resistance between E1 and E2.)
The output stage of this amplifier is also designed to be 500Ω load/1Vp-p.
4. Mixer Circuit
This circuit outputs the frequency difference between the signal input to IF IN and the local oscillator signal.
5. RF AGC Circuit
This circuit has high image quality in both strong and weak electric fields. In particular, it controls the RF IC
gain existing in the first stage of the CXA3556N to delay the characteristics related to S/N to the maximum
limits. The circuit controls the RF IC gain using RF AGC voltage (Pin 3) in order that signals input to IF IN
(Pins 1, 2) grow larger in weak electric fields. The RF AGC voltage at Pin 3 is obtained from results of a
comparison between the AGC control voltage (Pin 24 input voltage) that detects output signals and the
voltage at Pin 18 that can be freely set using the resistance value. When the control voltage is low, the RF IC
gain decreases and when the control voltage is high, the RF IC gain increases.
– 11 –
CXA3556N
IF down converter mode characteristics
Fig. 1. Gain vs. AGCIN voltage
Fig. 2. Output noise vs. input level
80
–60
–70
70
60
50
40
30
20
10
0
–80
–90
–100
–110
–120
–130
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
AGCIN voltage [V]
–70 –60 –50 –40 –30 –20 –10
0
Input level [dBm]
Fig. 3. IM3 vs. input level
Fig. 4. REFAGC voltage vs. AGCIN voltage
0
–10
–20
–30
–40
–50
–60
–70
10
9
8
7
6
5
4
3
R = 30kΩ
2
1
0
–70 –60 –50 –40 –30 –20 –10
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
Input level [dBm]
AGCIN voltage [V]
Fig. 5. Gain vs. resistance between E1 and E2
Fig. 6. Input characteristics
16
70MHz 109Ω
–625Ω
3.6pF
30MHz 488.44Ω –1.3237kΩ 4.0079pF
14
12
10
8
j50
j25
j100
6
4
30MHz
70MHz
0
50
2
0
–2
–4
1
10
Resistance between E1 and E2 [Ω]
Gain when 1kΩ is connected between E1 and E2 is 0dB.
100
1000 10000 100000 1E+06
–j100
–j25
Start 30MHz
Stop 70MHz
–j50
– 12 –
CXA3556N
Package Outline
Unit: mm
24PIN SSOP (PLASTIC)
+ 0.2
1.25 – 0.1
7.8 ± 0.1
0.1
24
13
A
1
12
b
0.13
M
0.65
B
b=0.22 ± 0.03
0.1 ± 0.1
DETAIL B : PALLADIUM
0˚ to 10˚
NOTE: Dimension " " does not include mold protrusion.
A
DETAIL
PACKAGE STRUCTURE
EPOXY RESIN
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PALLADIUM PLATING
SONY CODE
EIAJ CODE
SSOP-24P-L01
P-SSOP24-7.8x5.6-0.65
COPPER ALLOY
0.1g
JEDEC CODE
PACKAGE MASS
Sony Corporation
– 13 –
相关型号：
©2020 ICPDF网 联系我们和版权申明