Current Understanding of the TCM-2620 Operation --------------------------------------------------- Initial Rev. 27-JULY-1996 Current Rev. 12-SEPT-1996 Package: 68 pin quad (Leadless Chip Carrier ?) package 37 (or 37 ?) of these pins are used Current Understanding of the TCM-2620 Pins ------------------------------------------ Pin Pin Number Name Function Signal Type and Voltage ------ --------- ------------------------------- ----------------------- 2 LineChk Line Check Output Logic "Test" Output 3 TFSyncB Frame Sync Output Logic "Test" Output 4 TColRstB ??? Output Logic "Test" Output 5 TPhi1 Column Buffer Sample/Hold 1 Logic "Test" Output 6 TPhi2 Column Buffer Sample/Hold 2 Logic "Test" Output 11 TVClk Row Clock Logic "Test" Output 12 FrameChk Frame Check Logic "Test" Output 14 TRst Input Integrate Logic "Test" Output 15 TISHRst Input Sample/Hold Reset Logic "Test" Output 16 TISHB Input Sample/hold Logic "Test" Output 35 AmpHi CTIA Amplifter Supply +5 Volt Analog Supply (Detector Input Supply) 36 MuxSub Multiplexer Substrate 0 Volt Analog Return (Substrate Return and Detector Input Return) 37 CapBSwB Detector Integration Capacitor Digital Control Input Selector Switch 0V or +5V 0V --> Cint = 101.9 fF 5V --> Cint = 10.7 fF 38 DSub Detector Substrate Analog Control Input (Detector Input Substrate Return) 3.5 to 4 Volts 39 Temp1 Temperature Sensor Temperature Test Output 40 Temp2 Temperature Sensor Temperature Test Output 41 CellBias BDI Amplifier Bias, Set to 100 nA Analog "TEST" Output (Detector Input Amplifier Bias) normally 0.95 Volts 42 ColBiasN Column Buffer N-FET Bias, Analog "Test" Output Set to 2 uA normally 1.27 Volts 45 AutoBias Selects internal or external Digital Control Input Current Source for the Bias 0V or Float Generator 0V --> Internal 20 uA (50 uA ?) Source Selected Float --> External Current Source Selected 46 Mirror External 50 uA Current Source for Analog Control Input the Bias Generator. Float if 50 uA or Float AutoBias is 0V, i.e. float if internal current source is selected. 47 ColBias Small Buffer Inside Column Buffer Analog "Test Output Bias, Set to 500 uA normally 3.23 Volts 48 SlowBias Bias to control the rising time Analog "Test" Output of ISH normally 3.24 Volts 49 Cascode Input Amplifier Cascode Voltage Analog "Test" Output normally 3.46 Volts 50 ColBiasP Column Buffer P-FET Bias, Analog "Test" Output Set to 1 uA normally 3.38 Volts 53 ColHi Column Buffer Supply +5 Volt Analog Supply 54 ColLo Column Buffer Ground 0 Volt Analog Return 55 VClamp Voltage sets output voltage during Analog Control Input dead times 1 to 4 Volts 56 ABAmpHi AB Amplifier Supply +5 Volt Analog Supply 57 Out1 Output from Columns 1:64 Analog Video Output 58 Out2 Output from Columns 65:128 Analog Video Output 59 Out3 Output from Columns 129:192 Analog Video Output 60 Out4 Output from Columns 193:256 Analog Video Output 62 Clock Master Clock Digital Clock Input 63 Int Detector Input Integration Digital Clock Input Time Control Signal 64 Mode Input Sample/Hold Time Control Digital Control Input 0V --> 100 usec Sample Time 0 or 5 Volts 5V --> 10 usec Sample Time 65 Vss Digital Ground 0 Volt Digital Return 66 Vdd Digital Supply +5 Volt Digital Supply Operation - Setup: ------------------ Select the Integration Capacitor (either 10.7 fF or 101.9 fF) by pulling pin #37, CapBSwB, either voltage high -> 10.7 fF or low -> 101.9 fF. Select the Input Sample/Hold time (either 10 usec or 100 usec) by pulling pin #64, Mode, either voltage high -> 10 usec or low -> 100 usec. Select the internal or external current source for the bias generator by setting pin #45, AutoBias, voltage low -> internal or floating it to select the external current source . Set the Detector Substrate Voltage, pin #38, DSub. This is in the range 3.5 to 4 Volts. Set the output voltage during "dead time" via pin #55, VClamp. This is in the range 1 to 4 Volts. If an external current source has been selected for the bias generator (via floating AutoBias pin #45) then supply this current via the Mirror pin #46. If using the internal current source then float the Mirror pin. 1. My current guess is that permanently running from the internal current source for the bias generator is OK. Thus permanently grounding AutoBias and permanently floating Mirror is OK 2. My current guess is that selecting a permanent VClamp voltage (e.g. 2.5 Volts) is OK. 3. If these guesses are correct then only the digital control inputs: CapBSwB and Mode and the analog control input DSUB need to be set. Operation - Timing: ------------------- Integrate goes active (Voltage Hi) at a positive edge of Clock. Integrate takes effect at the next negative edge of Clock ?? Integrate goes inactive (Voltage Low) at a positive edge of Clock and you start counting negative edges of Clock until the first pixel arrives. Once pixel information starts coming out, new pixels arrive on both the positive and negative edges of the Clock. There are 4 Clock edges between rows. The Clock runs all of the time.