SP8034CB-3/TR [SIPEX]
Read/Write Amplifier Circuit, 1 Channel, BICMOS, 3 X 3.50 MM, COB-8;
| 型号： | SP8034CB-3/TR |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Read/Write Amplifier Circuit, 1 Channel, BICMOS, 3 X 3.50 MM, COB-8 放大器 驱动 信息通信管理 接口集成电路 |
| 文件： | 总6页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
PRELIMINARY
SP8034
250 V/µs APC Amplifier with Integrated Photodiode
and Gain Adjust Capability
FEATURES
■ꢀ Slew Rate of 250V/us
■ꢀ 7ns Settling Time to 1% for 1.5V Step
■ꢀ 10 mV Output Offset Voltage
■ꢀ 20uV/°C Output Offset Drift
■ꢀ Digital Gain Select
VCC
GAIN SEL
RGCOM
1
2
3
4
8
7
6
5
VOUT
S
P8034
VREF
RGAIN2
RGAIN1
8 Pin COB
GND
■ꢀ +/- 6 dB External Gain Adjust
DESCRIPTION
TheSP8034representsthenextgenerationAPCamplifierwithintegratedphotodetector. This
device monitors the light intensity of the laser diode in CD-R, CD-RW, DVD-R, DVD-RW and
DVD-RAMassembliesbysensingthelaserpowerwithanintegratedphotodiode. Theamplified
signalfromtheAPCcontainsthelaserpowerinformation. Thissignalissubsequentlyfedback
to the laser diode driver to control its power. The on-chip photodetector transforms incident
light into a proportional current. This current is then converted to a voltage through a
transimpedanceamplifier. Adjustablegainisprovidedinthetransimpedanceamplifierbymeans
of a gain control loop that is controlled by an external resistor. The external resistor is not part
ofthesignalpath, whichgreatlyreducestheeffectsofallparasiticcapacitancesandinductances
on the flex cable at these pins. The signal is buffered to provide reactive load drive
capability.
The SP8034 achieves an unparalleled level of performance by combining excellent DC sta-
bility and low noise with outstanding AC performance. This level of performance is achieved
using a proprietary fully complementary BiCMOS process with fully integrated, on-board
photodetectors. TheSP8034isofferedwithanominalgainof2000V/Wandispackagedina3.0mm
x 3.5mm, 8 lead COB package.
Gain Select
VCC
R1
R2
GND
2000
6000
VOUT
TIA
Buffer
6k
Gain Control
VREF
R1
R2
2000
6000
R
R
R
GCOM
GAIN1 GAIN2
Rg1
Rg2
Figure 1. Functional Diagram
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
TJ(MAX) ........................................................................................ 120°C
VS(MAX) ............................................................................................... 6V
VIN(MAX) .............................................................................................. 6V
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
ELECTRICAL SPECIFICATIONS
Unless otherwise noted: +4.5V ≤ꢀVCC ≤ꢀ+5.5V, CLOAD = 50pF to GND, RGAIN=400Ωꢀand RLOAD = 1kΩꢀto VREF
.
0°C≤TA≤ꢀ+70°C, VREF = 2.1V
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
4.5
5
5.5
V
Output Sensitivity
SP8034
Any Select Mode.
Laser Beam Diameter =
0.70mm, uniform density
2000
V/W
Output Sensitivity Change vs. VCC
Output Sensitivity Change vs. Temp
RGAIN = 950Ωꢀ
RGAIN = 950Ωꢀ
Any Select Mode
5
%/V
0.1
%/°C
Input Optical Power Required
to Produce 1.5V Output Swing
SP8034
mW
0.75
Full Scale Output Voltage Swing(Vp-p) Relative to VREF
-1.5 -1.7
V
V
Voltage Reference Range
Output Offset Voltage
RGAIN = 400Ωꢀ
1.9
-10
2.1
2.3
10
25
50
2
mV
Output Offset Voltage Drift
RGAIN = 400Ωꢀ
µV/°C
µV/°C
mV
RGAIN = 950Ωꢀ
Output Noise
BW: 1kHz to 1MHz
BW: 1kHz to 100MHz
1
3
Output Noise
5
mV
Output Slew Rate
200
65
250
7
V/µs
ns
Output Settling Time
to 1% of Final Value, 1.5V Step
15
5
Output Overshoot, 1.5V Step
Bandwidth (-3db)
PSRR*
%
RGAIN = 400Ωꢀ
100
MHz
Output Offset Voltage
RGAIN = 400Ωꢀ
RGAIN = 950Ωꢀ
55
50
73
75
20
dB
dB
Power Supply Current
TA = 25°C
mA
Full Temp
25
+6
+6
Gain Adjust Range VCC=+5.0V
Gain Adjust Range VCC=+4.5V
150Ωꢀ< RGAIN < 950Ωꢀ
250Ω< RGAIN < 950Ωꢀ
-6
-3
dB
dB
Input Voltage
Vlow (TTL Level)
Vhigh (TTL Level)
0.8
V
V
2.4
TJA, 3mm x 3.5mm Package
90
°C/W
* PSRR = 20 * log ( ∆ꢀVSUPPLY / ∆ꢀVOUT
)
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER
NAME
VCC
FUNCTION
Supply Voltage
GAIN Select
1
2
3
4
5
6
7
8
GAIN
RGCOM
GND
Common connection point for RGAIN1 and RGAIN2
Power Ground
RGAIN1
RGAIN2
VREF
Gain Adjust 1(Gain Select = LOW)
Gain Adjust 2 (Gain Select = HIGH)
Reference Voltage
VOUT
Output Voltage
THEORY OF OPERATION
The SP8034 is an Automatic Power Control
(APC) circuit for pick-up head applications.
The part consists of a photo-detector that con-
verts the light (780nm or 650nm) into current,
and active circuitry (transimpedance amp-
lifier and buffer) to convert the current into
voltage. The overall transfer characteristics are
therefore represented by a Voltage per Watt
curve.
5000
4500
4000
3500
3
2
0
0
0
5
2000
0
0
1500
There are three pins for gain adjust, using two
separate external resistors for two separate gain
modes. This allows different adjust for a DVD
and a CD mode.
1000
0
0
100 200 300 400 500 600 700 800 900 1000
Gain Adjust Resistor (Ω)
The two resistors are each tied from the corres-
ponding RG pin (pin 5 or 6, depending on the
mode) to the common gain pin (pin 3). The gain
adjust is proportional to the external resistance
and is done by means of an analog duplication
circuit that translates the resistance value in an
active feedback circuit at the transimpedance
amplifier. The fact that the external resistor is
not in the signal path ensures a better signal
quality and immunity to the parasitic capacit-
ance/inductance on the pins 3,5 and 6.
Figure 2. Sensitivity vs. Gain Resistor (Absolute)
100M
95.0M
90.0M
85.0M
80.0M
75.0M
70.0M
65.0M
60.0M
55.0M
50.0M
45.0M
In dark condition, the output of the circuit will
remain at the externally supplied VREF (1.9V ≥ꢀ
2.3V). When light (650nm or 780nm) is re-
ceived on the photo-diode, the output (VOUT, pin
0.0
200
400
600
800
1.0K
8) will swing negative with respect to VREF
.
R
GAIN
The output swing is guaranteed to be at least
1.5V from VREF. For example, with VREFat 2V,
the output can swing at least as low as 0.5V
(absolute).
Figure 3. System Bandwith versus Gain Resistor,
VCC = 5V, T = 27C.
Gain (dB)
Sensitivity (mV/mW)
Regain (Ω)
950
Ts(nS) 1%
BW (MHz)
Pin(uW)
380
+6
4
2
13
12
11
10
61
79
87
93
0
-3
400
750
1.4
1
250
1070
1500
-6 *
150
* V CC≥ꢀ5.0V
Table 1. Target Gain Set Points for the System.
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
3
LAYOUT AND ROUTING CONSIDERATIONS
A major consideration in developing the optical
pick-upheadsystemistheextremelysmallform
factor, which is additionally aggravated by the
physical locations required by the light path.
Special care must be taken when designing the
Flex or PCB for this part. The output peak
current requirement is in the order of 12.5 mA
when driving 50pF of capacitive load with a
slew rate of 250V/µs. Therefore care must be
taken to provide low inductance, low resistance
paths for power and ground and output traces.
Supply coupling is also very important. Good
supply decoupling is important to ensure the
high frequency performance of the system by
eliminating supply lead inductance effects. The
decoupling capacitor C1, as shown in Figure 5,
should be as close to the part as possible.
This capacitor should be 0.1µF ceramic. C2 is
optional to improve decoupling and is recom-
mended to be 1 µF tantalum. The layout of the
PCB is pictured here. Note the wide and short
traces on the supply lines.
The traces for the gain resistors RGAIN1 and
RGAIN2 are kept as short as possible to avoid ex-
cessive parasitics. Any parasitics on these nodes
will limit the performance of the system. RGAIN
1
and RGAIN2 are subminiature potentiometers in
the application. This is a single layer board using
FR4 material.
In order to minimize coupling capacitance into
the gain setting resistor nodes, it is also critical
that VOUT+ and VOUT- are routed away from
the traces associated with the gain-setting
resistors.
V
V
O
V
CC
RL
PIN
GAIN
GND
REF
R2
R1
CR
GND
Figure 4. Evaluation Board.
V
+5V
OUT
+
+
RS
CL1
+
C1
50pF
0.1µF
V
OUT
8
V
CC
1
®
Depends
on FPC
V
REF
7
GAIN
RL
1k
GAIN
2
3
4
C2
0.1µF
R
R
SP8034
GAIN2
GCOM
6
5
R
GAIN1
GND
V
REF
R
G1
400
R
G1
400
Figure 5. Test Circuit - Cload = 50p, VCC = 5V, Gain = 0V, Rgain = 400.
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
4
PACKAGE: 8 PIN COB (3mm x 3.5mm)
0.090mm
8
7
1
2
3
4
b
0.600mm
D
6
5
e
L
H
PIN
SIDE VIEW
TOP VIEW
BOTTOM VIEW
E
B
DIMENSIONS in
A
mm
8–PIN
COB
C
Minimum/Maximum
A
B
b
0.90/1.10
.127/.33
SIDE VIEW
0.30/0.50
0.50 nom
2.90/3.10
3.00/3.20
0.75 nom
3.40/3.60
0.40/0.60
C
D
E
e
DETECTOR SIZE
0.35mm
H
L
0.70mm
Detector Area
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
5
ORDERING INFORMATION
Package Type
Part Number
Temperature Range
SP8034CB-3............................................-20°C to +85°C .............. 8 lead COB (3.0mm x 3.5mm)
SP8034CB-3/TR......................................-20°C to +85°C .............. 8 lead COB (3.0mm x 3.5mm)
Co rp o ra tio n
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev. 5/21/03
SP8034 APC Amplifier with Integrated Photodetector
© Copyright 2003 Sipex Corporation
6
相关型号：
©2020 ICPDF网 联系我们和版权申明