Electronic Components Datasheet Search |
|
MP7652 Datasheet(PDF) 7 Page - Exar Corporation |
|
MP7652 Datasheet(HTML) 7 Page - Exar Corporation |
7 / 16 page MP7652 7 Rev. 1.00 THEORY OF OPERATION The MP7652 is a 4-channel multiplying D/A converter that in- corporates a novel open loop architecture invented by MPS. The design produces the widest bandwidth, fastest settling time, most constant group delay, and a very low noise operation compared to the conventional R-2R based architectures (given an equal technology platform). This device is particularly useful in applications where analog multipliers are used to perform the gain adjustment function for high frequency analog signal condi- tioning. Analog multipliers produce much higher noise and. This design allows for digital control of gain with constant and very low noise for all gain settings. Linearity Characteristics Each DAC achieves DNL +0.5 LSB (typ), INL +1 LSB (typ), and gain error +1.5%. Since all 4 channel D/A convert- ers are fabricated on the same IC, the linearity matching and gain matching of +0.5% (typ) is achieved. AC and Low Noise Performance The novel subranging architecture delivers a 15 MHz (type) –3 dB bandwidth. A constant group delay of 70 ns (typ) is achieved to frequencies up to 8 MHz. Analog output settling time for a code change of FS to ZS and ZS to FS with VREFP = 3 V, is typically 150 ns (with RL = 5 k to VEE). Also, with all codes set to FS (all 1s) and a VREFP 3 V step, the analog output will settle to 8 bits in less than 110 ns (typ). Note that the AC perfor- mance specifications also match to between all 4 channels. The above AC and transient performance is achieved with each channel consuming only 20 mW (typ) with 10 V p-p supplies. Serial Port MP7652 is equipped with a serial data 3-wire standard µ-proc- essor logic interface to reduce pin count, package size, and board wire (space). This interface consists of LD which controls the transfer of data to the selected DAC channel, SDI (serial data/address input), CLK (shift register clock) and SDO (serial data output). When the LD signal is high, CLK signal loads the digital input bits (SDI) into the 12-bit shift register. The LD signal going low loads this data into the selected DAC. The LD signal going low also disables the serial data input (SDI), output (SDO tri-stated) and the CLK input. This design tremendously re- duces digital noise, and glitch transients into the DACs due to free running CLK and SDI. Also, tri-stating the SDO output with LD signal would allow read back of pre-stored digital data of the selected package using one SDO wire for all DAC ICs on the board. When the PRESET signal is low, the output of all DACs are 1/2 of (VREFP + VREFN), regardless of any digital inputs. Note that VREFP is referenced to VREFN. Power Supplies and Voltage Reference DC Voltage Ranges For the single supply operation, VCC = +10 V, VDD = +5 V, and VEE = DGND = 0 V. The VO 1-4 and VREFP 1-4 range would be VCC –1.8 V (10 – 1.8 = 8.2 V) to VEE +1.5 V (0 + 1.5 = 1.5 V). VREFN is the equivalent of AGND for this DAC. In this mode VREFN can be set at (VCC + VEE)/2 = (10 + 0)/2 = 5 V. VREFN 1-4 DC range can also be set from VEE +1.5 = 1.5 V to VCC – 1.5 = 8.2 V. Refer to Table 2. for the relationship equations. For the dual supply operation, VCC = +5, VDD = +5, and VEE = –5 V. The VOUT 1-4 and VREFP 1-4 range would be VCC –1.8 V (–1.8 = 3.2 V) to VEE +1.5 V (–5 + 1.5 = –3.5 V). In this mode VREFN can be set to (VCC + VEE)/2 = (5 – 5)/2 = 0 V. Similarly, VREFN 1-4 DC range can be set from VEE +1.5 V = 3.5 V to VCC –1.8 = +3.2 V. Refer to Table 2. for the relationship equations. VCC VOUT 1-4 I1 Q2 Q1 VREFP 1-4 VREFN 1-4 DAC VEE +1 Figure 4. Simplified Block Diagram |
Similar Part No. - MP7652 |
|
Similar Description - MP7652 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |