Datasheet ADN2891 (Analog Devices) - 9

Data Sheet ADN2891 1200 900 800 1000 700
µ
A) 800 600 500 600 400 400 300
µ
A REFERRED OFFSET (nA) RSSI OUTPUT CURRENT ( 5 200 200 100 0
05244-018
0
05244-025
0 200 400 600 800 1000 1200 –40 –20 0 20 40 60 80 100 PD_CATHODE CURRENT (PHOTODIODE CURRENT) (
µ
A) TEMPERATURE (
°
C)
Figure 14. RSSI Output vs. Average Photodiode Current Figure 17. RSSI Offset is the Difference Between Measured RSSI Output and PD_CATHODE (Input) Current of 5 µA
60 5.0 4.5 50 4.0
µ
A) 3.5 40 3.0 30 2.5 2.0 +100
°
C +30
°
C 20 RSSI LINEARITY (%) 1.5 RSSI OUTPUT CURRENT ( 1.0 10 0.5 –40
°
C 0
05244-028
0
05244-029
0 10 20 30 40 50 60 0 200 400 600 800 1000 PD_CATHODE CURRENT (PHOTODIODE CURRENT) (
µ
A) PD_CATHODE CURRENT (
µ
A)
Figure 15. RSSI Output vs. Average Photodiode Current (Zoomed) Figure 18. RSSI Linearity % vs. PD_CATHODE Current
–0.15 44.5 –0.20 44.0 –0.25 –0.30 43.5 –0.35 43.0 –0.40 (mA) –0.45 I CC 42.5 –0.50 –0.55 42.0 –0.60 41.5 –0.65 COMPLIANCE VOLTAGE REFERRED TO VCC (V) –0.70
05244-023
41.0
05244-024
0 100 200 300 400 500 600 700 800 900 1000 –60 –40 –20 0 20 40 60 80 100 120 INPUT CURRENT (
µ
A) TEMPERATURE (
°
C)
Figure 16. PD_CATHODE Compliance Voltage vs. Figure 19. ADN2891 ICC Current vs. Temperature Input Current RSSI (Refer to VCC) Rev. B | Page 9 of 16 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION LIMITING AMPLIFIER Input Buffer CML Output Buffer LOSS OF SIGNAL (LOS) DETECTOR RECEIVED SIGNAL STRENGTH INDICATOR (RSSI) SQUELCH MODE APPLICATIONS PCB DESIGN GUIDELINES Output Buffer Power Supply and Ground Planes PCB Layout Soldering Guidelines for the LFCSP OUTLINE DIMENSIONS ORDERING GUIDE