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PDF DS1863 Data sheet ( Hoja de datos )
| Número de pieza | DS1863 | |
| Descripción | Burst Mode PON Controller | |
| Fabricantes | Maxim Integrated Products | |
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Rev 0; 10/06
Burst-Mode PON Controller
With Integrated Monitoring
General Description
The DS1863 controls and monitors all the burst-mode
transmitter and video receiver biasing functions for a
passive optical network (PON) triplexer. It has an APC
loop with tracking-error compensation that provides the
reference for the laser-driver’s bias current, and a tem-
perature indexed lookup table (LUT) that controls the
modulation current. It continually monitors for high output
current, high bias current, and low and high transmit
power with its internal fast comparators to ensure that
laser shutdown for eye safety requirements are met with-
out adding external components. Five ADC channels
monitor VCC, internal temperature, and three external
monitor inputs (MON1–3) that can be used to meet trans-
mitter and receive monitoring requirements.
Applications
BPON, GPON and GEPON, Burst-Mode Transmitters
Laser Control and Monitoring
Broadband Local Access
Features
o Meets BPON, GPON, and GEPON Timing
Requirements for Burst-Mode Transceivers
o Bias Current Control provided by APC Loop with
Tracking Error Compensation
o Modulation Current is Controlled by a
Temperature-Indexed Lookup Table
o Supports 0dB, -3dB, -6dB Power Leveling
Settings with no Additional Calibration
o Internal Direct-to-Digital Temperature Sensor
o Five Analog Monitor Channels: Temperature, VCC,
MON1, MON2, and MON3
o Comprehensive Fault Management System with
Maskable Laser Shutdown Capability
o Two-Level Password Access to Protect
Calibration Data
o 120 Bytes of Password 1 (PW1) Protected
Nonvolatile Memory
o 128 Bytes of Password 2 (PW2) Protected
Nonvolatile Memory
o I2C-Compatible Interface for Calibration and
Monitoring
o Operating Voltage: 2.85V to 5.5V
o Operating Temperature: -40°C to +95°C
o 16-Pin Lead-Free TSSOP Package
Pin Configuration
TOP VIEW
+
BEN 1
TX-D 2
N.C. 3
TX-F 4
FETG 5
DS1863
SDA 6
SCL 7
GND 8
16 VCC
15 BMD
14 MOD
13 BIAS
12 GND
11 MON3
10 MON2
9 MON1
TSSOP
(173 mils)
Ordering Information
PART
DS1863E+
DS1863E+T&R
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
+Denotes lead-free package.
T&R denotes tape-and-reel.
PIN-PACKAGE
16 TSSOP
16 TSSOP
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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(VCC= 3.3V; TA = +25°C, unless otherwise noted.)
Burst-Mode PON Controller
With Integrated Monitoring
Typical Operating Characteristics
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.00
3.85 SDA = SCL = VCC
3.70
+95°C
3.55
3.40
3.25
3.10
+25°C
2.95 -40°C
2.80
2.65
2.50
2.85 3.35 3.85 4.35 4.85 5.35
VCC (V)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
MOD INL
50 100 150 200
MOD INPUT CODE (DEC)
250
SUPPLY CURRENT vs. TEMPERATURE
3.50
SDA = SCL = VCC
3.45
3.40
3.35
3.30
3.25
3.20 VCC = 2.85V
3.15 VCC = 5.5V
3.10
3.05
3.00
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
CALCULATED AND DESIRED % CHANGE
IN VMOD vs. MOD RANGING
100
90 DESIRED VALUE
CALCULATED VALUE
80
70
60
50
40
30
20
10
0
000 001 010 011 100 101 110 111
MOD RANGING VALUE (DEC)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
MOD DNL
50 100 150 200
MOD INPUT CODE (DEC)
250
DESIRED AND CALCULATED CHANGE
IN VBMD vs. COMP RANGING
100
90 DESIRED VALUE
CALCULATED VALUE
80
70
60
50
40
30
20
10
0
000 001 010 011 100 101 110 111
COMP RANGING (DEC)
MON1–3 DNL
1.0
0.8
USING FACTORY-PROGRAMMED
FULL-SCALE VALUE OF 2.5V
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
0.5 1.0 1.5 2.0
MON1–3 INPUT VOLTAGE (V)
2.5
MON1–3 INL
1.0
0.8
USING FACTORY-PROGRAMMED
FULL-SCALE VALUE OF 2.5V
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
0.5 1.0 1.5 2.0
MON1–3 INPUT VOLTAGE (V)
2.5
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
VBMD INL vs. APC INDEX
50 100 150 200
APC INDEX (DEC)
250
_____________________________________________________________________ 5
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Burst-Mode PON Controller
With Integrated Monitoring
APC LOOP/QUICK TRIP SAMPLE TIMING
BEN tFIRST
BIAS DAC
CODE
QUICK-TRIP
SAMPLE TIMES
LAST BURST'S
BIAS SAMPLE
BIAS
SAMPLE
tREP
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
BIAS
SAMPLE
H/LTXP
HBIAS
SAMPLE SAMPLE
Figure 3. APC/Quick-Trip Alarm Sample Timing.
Monitors And Fault Detection
Monitors
Monitoring functions on the DS1863 include four quick-
trip comparators and five ADC channels
This monitoring combined with the interrupt masks
determines when/if the DS1863 shuts down its outputs
and triggers the TX-F and FETG outputs. All of the mon-
itoring levels and interrupt masks are user programma-
ble with the exception of POA, which trips at a fixed
range and is non-maskable for safety reasons.
Four Quick-Trip Monitors And Alarms
Four quick-trip monitors are provided to detect potential
laser safety issues. These monitor
1) High Bias Current (HBIAS)
2) Low Transmit Power (LTXP)
3) High Transmit Power (HTXP)
4) Max Output Current (MAX IBIAS)
The high and low transmit power quick-trip registers
(HTXP and LTXP) set the thresholds used to compare
against the BMD voltage to determine if the transmit
power is within specification. The HBIAS quick-trip
compares the MON1 input (generally from the
MAX3643 bias monitor output) against its threshold set-
ting to determine if the present bias current is above
specification. The Max Bias quick-trip is a digital com-
parison that determines if the Bias Output code indi-
cates the bias current is above specification. The bias
current will not be allowed to exceed the value set in
this register. When the DS1863 detects the bias is at
the limit it will set the BIAS MAX status bit and hold the
bias current at the MAX IBIAS level. The quick-trips are
routed to the TX-F and FETG outputs via interrupt
masks to allow combinations of these alarms to be
used to trigger these outputs. Any time FETG is trig-
gered the DS1863 will also disable its outputs. All the
quick-trip alarm levels and masks are programmable
through the I2C interface.
Five ADC Monitors And Alarms
The ADC monitors five channels that measure tempera-
ture (internal temp sensor), VCC, MON1, MON2, and
MON3 using an analog multiplexer to measure them
round robin with a single ADC. Each channel has a
customer programmable full scale range and offset
value that will be factory programmed to default value
(see below). Additionally, MON1, MON2, and MON3
have the ability to right shift results by up to 7 bits
before the results are compared to alarm thresholds or
read over the I2C bus. This allows customers with spec-
ified ADC ranges to calibrate the ADC full scale to a
factor of 1/2n of their specified range to measure small
signals. The DS1863 can then right shift the results by n
bits to maintain the bit weight of their specification.
ADC Default Monitor Full Scale Ranges
SIGNAL (UNITS)
Temperature (oC)
VCC (V)
MON1, MON2,
MON3 (V)
+ FS
SIGNAL
127.996
6.5528
2.4997
+ FS
HEX
7FFF
FFF8
FFF8
- FS
SIGNAL
-128
0V
0V
- FS
HEX
8000
0000
0000
The ADC results (after right shifting, if used) are com-
pared to high alarm thresholds (to check if the results
exceeded this threshold), the low alarm thresholds (to
check if the ADC results are below this threshold) and
the warning threshold after each conversion (20 com-
parisons total), and the corresponding alarms are set
which can be used to trigger the TX-F or FETG outputs.
These ADC thresholds are user programmable via the
I2C interface, as are the masking registers that can be
____________________________________________________________________ 11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS1863.PDF ] | |
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