1
Copyright 2002, Capella Microsystems, Inc.
880 East Arques Avenue, Sunnyvale, CA 94085-4536 USA 408.328.8360 FAX.408.328.8361
P
REL
I
M
I
N
A
R
Y
P
ROD
U
C
T
D
AT
AS
HE
E
T
-- C
O
NF
ID
ENT
I
AL
CM1221
Power Monitor PDIC
DESCRIPTION
The CM1221 is a power monitor PDIC
(PMIC) developed for CD-R and CD-RW
optical pickup applications. The CM1221 is
a fully integrated trans-impedence
amplifier and photodiode on the same
silicon. The package is a COB-6PIN that is
suitable for compact, thin optical pickups.
The CM1221 also incorporates Capella's
patented Automatic Calibration Circuitry
(ACC) to reduce the offset. The ACC
completes the calibration process before
the disk is up to speed.
FEATURES
Designed for CD-R and CD-RW applications
Frequency characteristics: 100MHz (min)
Gain control can be changed by external
resistor (100~500)
Compact and thin package (COB-6PIN)
Solder re-flowing permitted
APPLICATIONS
CD-R and CD-RW Optical Pickups
DVD/CD-R/CD-RW Combo Pickups
DISCLAIMER
This preliminary data sheet indicates that this product is still in the design cycle. All specifications are based on design goals
only. Capella Microsystems Inc. assumes no responsibility for the use of this product.
Capella Microsystems Inc. reserves the right to make changes in specifications or discontinue this product at any time
without notice. Please contact Capella Microsystems Inc. for possible updates before starting a design.
Capella Microsystems Inc. products are not designed for use in life support applications. Any parties who use these products
in such applications do so at their own risk and agree to fully indemnify Capella Microsystems Inc. for any damages resulting
from such improper usage or sale.
Revision: 0.3
Date: 14-Jan-2002
CM1221 -- Power Monitor PDIC
2
Copyright 2002, Capella Microsystems, Inc.
P
REL
I
M
I
N
A
R
Y
P
ROD
U
C
T
D
AT
AS
HE
E
T
-- C
O
NF
ID
ENT
I
AL
Figure 1: CM1221 Block Diagram
Absolute Maximum Ratings
Description Symbol Value Unit
Power Supply Voltage
V
CC
7.0 V
Power Dissipation
Pd
240
mW
Storage Temperature
Tstg
-40 ~ +85
C
Recommended Operating Conditions
Note 1: V
REF
must be able to sink/source 500A
Note 2: V
REF
must be stable and within operating range 50ms after power-up
Description Signal
Condition
Min.
Typ.
Max.
Unit
Operating Supply Voltage Range
V
CC
- 4.5
5.0
5.5
V
Operating Reference Voltage Range
V
REF
(Note
1,
2) 2.3 2.5 2.7 V
Operating Temperature Range
Topr
0
70
C
CM1221 -- Power Monitor PDIC
3
Copyright 2002, Capella Microsystems, Inc.
P
REL
I
M
I
N
A
R
Y
P
ROD
U
C
T
D
AT
AS
HE
E
T
-- C
O
NF
ID
ENT
I
AL
Table 1: CM1221 Pin Descriptions
Electrical Characteristics
(Ta = 25C, V
CC
= 5V, V
S
=2.5V, R
L
=10K, C
L
= 15pf, =780 nm, VR=200)
Note 2: Dark conditions, which implies no light incident on the photodiode.
Note 3: Guaranteed by design.
Pin
No.
Pin
Signal
I/O
Pin Description
1 V
CC
I
5V 10% DC Supply
2 V
REF
I
Reference voltage input pin
provided by a stable external
voltage source.
3 GND I
GND
(Ground)
4
I/VOUT
O
I/V Amplifier Output
5 IN I Latter
Amplifier
Input
6 OUT O
Output
Description
Symbol
Condition
Min. Typ. Max. Unit Applies
to
Current Consumption
I
CC
(Note 2)
18
mA
V
CC
DC Output Voltage
(Sensitivity)
GV
OUT
DC
Gain
(Note 3) -1.5
-2.0
-2.6
mV/W
OUT
Output Offset Voltage
V
OS
(Note 2) -8
0
+8
mV
OUT
Cutoff Frequency
f
C
-3dB point for 1MHz
modulated signal (Note 3)
100 - - MHz OUT
Response Characteristic
T
r
, T
f
Time (rise time, fall time)
for a 1V
p-p
pulse (Note 3)
- 3.5 - ns OUT
Maximum Output
Voltage
V
OUT
Output minimum voltage
with reference to GND
- 0.8 1.0 V OUT
Automatic Calibration
power on setup time
T
SU
During power up (Note 3) - - 150 ms
Automatic Calibration
Time
T
ACC
During power up (Note 3) - - 100 s
CM1221 -- Power Monitor PDIC
4
Copyright 2002, Capella Microsystems, Inc.
P
REL
I
M
I
N
A
R
Y
P
ROD
U
C
T
D
AT
AS
HE
E
T
-- C
O
NF
ID
ENT
I
AL
Vcc
ACC
Internal
Power-On
Reset
Tsu
Tacc
Under Voltage Lockout Threshold (Vuvc)
Figure 2: Automatic Calibration Timing Diagram
0.5
1.1
PDIC
4.0
0.1
5
4
P1.25 x 2 =
2.5
1.77
0.2
(IC Center)
Photo Detector
=0.7
Package Center
1
2
3
3.80.1
5.00.1
0.7
1.4
0.2
2.50.2
(IC and Photo Detector Center)
(Photo Detector Center)
Package Center
resisit
PDIC
6
Unit: (mm)
0.5
1.1
PDIC
Sealed Resin
0.30.1
Figure 3: CM1221 COB Package Dimensions
PDF 
ZIP