DS1873T+ Maxim Integrated Products, DS1873T+ Datasheet - Page 12
![no-image](/images/manufacturer_photos/0/4/417/maxim_integrated_products_sml.jpg)
DS1873T+
Manufacturer Part Number
DS1873T+
Description
IC CTLR SFP+ ANLG LDD 28-TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Controllerr
Datasheet
1.DS1873TTR.pdf
(86 pages)
Specifications of DS1873T+
Number Of Channels
1
Voltage - Supply
2.85 V ~ 3.9 V
Current - Supply
2.5mA
Operating Temperature
-40°C ~ 95°C
Package / Case
28-WFQFN Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
90-1873T+000
- Current page: 12 of 86
- Download datasheet (2Mb)
The DS1873 integrates the control and monitoring func-
tionality required to implement an SFP or SFP+ system.
Key components of the DS1873 are shown in the Block
Diagram and described in subsequent sections.
The DS1873 controls its laser bias current using its
BIAS DAC and the APC loop. The APC loop’s feedback
to the DS1873 is the monitor diode (MON2) current,
which is converted to a voltage using an external resis-
tor. The feedback is sampled by a comparator and
SFP+ Controller with Analog LDD Interface
12
______________________________________________________________________________________
R
BD
Detailed Description
TOSA
BIAS DAC/APC Control
100Ω
+3.3V
R
MON
ROSA
LOS
BIAS MON
MON1
MON2
MON3
MOD
BIAS
DAC
DAC
compared to a digital set-point value. The output of the
comparator has three states: up, down, or no-opera-
tion. The no-operation state prevents the output from
excessive toggling once steady state is reached. As
long as the comparator output is in either the up or
down states, the bias is adjusted by incrementing and
decrementing the BIAS DAC setting.
The DS1873 has an LUT to allow the APC set point to
change as a function of temperature to compensate for
tracking error (TE). The TE LUT has 36 entries that
determine the APC setting in 4°C windows between
-40°C to +100°C.
DS1873
LDD
EEPROM
QUICK
TRIP
ADC
LOS
I
DISABLE
2
TXDOUT
LOSOUT
C
Typical Operating Circuit
SDA
TXD
SCL
LOS
TXF
TX_FAULT
TX_DISABLE
MODE_DEF2 (SDA)
MODE_DEF1 (SCL)
LOS
Related parts for DS1873T+
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ds1873](/images/no-image3.png)
Part Number:
Description:
Sfp+ Controller With Analog Ldd Interface
Manufacturer:
Maxim Integrated Products, Inc.
Datasheet:
![MAX7528KCWP](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
MAX7528KCWPMaxim Integrated Products [CMOS Dual 8-Bit Buffered Multiplying DACs]
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX3261CCJ](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX3263CAG](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX8809AETL+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
![MAX1535CETJ+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
![DS2741N+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
![MAX13450EAUD+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TSSOP 14/A/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
![MAX13451EAUD+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TSSOP 14/A/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
![MAX17497BATE+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
QFN 16/A/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
![MAX17502FATB+T](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products
![MAX1978EVKIT](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
Integrated Temperature Controller f
Manufacturer:
Maxim Integrated Products
![MAX2606EUT+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
SOT23-6/I/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
![MAX2608EUT+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
SOT23-6/I/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
![MAX2831EVKIT+](/images/manufacturer_photos/0/4/417/maxim_integrated_products_tmb.jpg)
Part Number:
Description:
EVALUATION KIT/2.4GHZ TO 2.5GHZ 802.11G/B RF TRANSCEIVER WITH INTEGRATED PA
Manufacturer:
Maxim Integrated Products