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MAX9546 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX9546 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Common-Mode Balance A driver is typically specified as having a property called common-mode balance (CMB), longitudinal balance, or simply line imbalance. Although balance is associated with the source, it assumes a perfectly balanced, cor- rectly terminated, differential load. Common-mode bal- ance is a measure of the ratio between the differential to the common-mode output in decibels as shown below. Common-mode balance is dominated by the gain-band- width product at high frequencies and the output resis- tance at low frequencies; therefore, it is important to specify CMB over a frequency range. The receiver-side balance is determined by the common-mode rejection ratio (CMRR). The CMRR is usually quite large compared to the CMB; therefore, the CMB is the limiting factor. Fault Protection and Detection The MAX9546 fault protection insures the driver outputs survive a short to any voltage from -2V to +16V and are ESD-protected to ±15kV HBM. Faults are indicated by an open-drain fault output (FAULT) being asserted low and requires a pullup resistor from FAULT to VCC. MAX9547 Receiver The MAX9547 receiver is a differential-to-single-ended converter that removes any common-mode input. The unique architecture allows the signal gain to be set by a ratio of two impedances: the user-selected transcon- ductance element or network (ZZT), and an output load resistance, RL. The gain is set by a fixed internal cur- rent gain (K) and the ratio of ZZT and RL. The ZT termi- nals can be bridged with a complex impedance to provide lead-lag compensation. The output is essentially a voltage-controlled current source as shown in Figure 1. The MAX9547 output is a current proportional to the differential input voltage, and inversely proportional to the impedance of the user- selected transconductance network, ZZT. The current output provides inherent short-circuit protection for the output terminal. A differential input voltage applied to the input terminals causes current to flow in the transconductance element (ZZT), which is equal to VIN / ZZT. This current in the transconductance element is multiplied by the preset current gain (K) and appears on the output terminal as a current equal to (K) x (VIN / ZZT). This current flows through the load impedance to produce an output voltage according to the following equation: where K = current-gain ratio (K = 1 for MAX9547), RL = output load impedance, ZZT = transconductance ele- ment impedance, VIN = differential input voltage. Loss-of-Signal The receiver includes an LOS output to indicate a sig- nal by detecting the presence of H-Sync. This allows the MAX9547 to be used with monochrome or color video. LOS is an open-drain output and requires a pullup resistor from LOS to VCC. Setting the Circuit Gain The MAX9547 produces an output current by multiply- ing the differential input voltage, VIN, by the transcon- ductance ratio, K (RL / ZZT), where K = 1. The voltage gain (AV) is set by the impedance of the transconduc- tance network (ZZT) and the output load impedance (RL) according to the following formula: The factor ZZT is the impedance of the user-selected, two-terminal transconductance element or network, connected across the terminals labeled ZT+ and ZT-. The network ZZT is selected, along with the output impedance RL, to provide the desired circuit gain and frequency shaping. To maintain linearity, the transconductance network should also be selected so that current flowing through it, equal to VIN / ZZT, does not exceed 18mA under worst-case conditions of maximum input voltage and minimum transconductance element impedance (ZZT). Output current should not exceed ±8.8mA except under fault conditions. AK R Z V L ZT = ⎛ ⎝⎜ ⎞ ⎠⎟ VK V Z R OUT IN ZT L = ⎛ ⎝⎜ ⎞ ⎠⎟ CMB Log OUT OUT OUT OUT = + () ( ) + ()+() ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ −− − 20 Differential Video Interface Chipset 8 _______________________________________________________________________________________ Figure 1. Operational Mode ZZT K VIN VIN IN+ IN- IOUT 1 + 7 - 4 |
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